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Rh this to the case of children. When their parents' necessities called for their assistance, they pleaded, that all they could spare from themselves and their children, they had devoted to the treasury of the temple; It is a gift, by whatsoever thou mightest be profited by me, and therefore their parents must expect nothing from them; suggesting withal, that the spiritual advantage of what was so devoted, would redound to the parents, who must live upon that air. This, they taught, was a good and valid plea, and many undutiful, unnatural children made use of it, and they justified them in it, and said, He shall be free; so we supply the sense. Some go further, and supply it thus, "He doth well, his days shall be long in the land, and he shall be looked upon as having duly observed the fifth commandment." The pretence of religion would make his refusal to provide for his parents not only passable but plausible. But the absurdity and impiety of this tradition were very evident; for revealed religion was intended to improve, not to overthrow, natural religion; one of the fundamental laws of which is this of honouring our parents; and had they known what that meant, I will have justice, and mercy, and not sacrifice, they had not thus made the most arbitrary rituals destructive of the most necessary morals. This was making the command of God of no effect. Note, Whatever leads to, or countenances, disobedience, does, in effect, make void the command; and they that take upon them to dispense with God's law, do, in Christ's account, repeal and disannul it. To break the law is bad, but to teach men so, as the Scribes and Pharisees did, is much worse, ch. 5. 19. To what purpose is the command given, if it be not obeyed? The rule is, as to us, of none effect, if we be not ruled by it. It is time for thee, Lord, to work; high time for the great Reformer, the great Refiner, to appear; for they have made void thy law; (Ps. 119. 126.) not only sinned against the commandment, but, as far as in them lay, sinned away the commandment. But, thanks be to God, in spite of them and all their traditions, the command stands in full force, power, and virtue.

2. The other part of Christ's answer is by way of reprehension; and that which he here charges them with, is hypocrisy; Ye hypocrites, v. 7. Note, It is the prerogative of him who searcheth the heart, and knows what is in man, to pronounce who are hypocrites. The eye of man can perceive open profaneness, but it is only the eye of Christ that can discern hypocrisy, Luke 16. 15. And as it is a sin which his eye discovers, so it is a sin which of all others his soul hates.

Now Christ fetches his reproof from Isa. 29. 13. Well did Esaias prophesy of you. Isaiah spoke it of the men of that generation to which he prophesied, yet Christ applies it to these Scribes and Pharisees. Note, The reproofs of sin and sinners, which we find in scripture, were designed to reach the like persons and practices to the end of the world; for they are not of private interpretation, 2 Pet. 1. 20. The sinners of the latter days are prophesied of, 1 Tim. 4. 1. 2 Tim. 3. 1. 2 Pet. 3. 3. Threatenings directed against others, belong to us, if we be guilty of the same sins. Isaiah prophesied not of them only, but of all other hypocrites, against whom that word of his is still levelled, and stands in force. The prophecies of scripture are every day in the fulfilling.

This prophecy exactly deciphers a hypocritical nation, Isa. 9. 17.—10. 6. Here is,

(1.) The description of hypocrites, in two things,

[1.] In their own performances of religious worship, v. 8. When they ''draw nigh to God with their mouth, and honour him. with their lips, their heart is far from him''. Observe,

First, How far a hypocrite goes; he draws nigh to God, and honours him; he is, in profession, a worshipper of God. The Pharisees went up to the temple, to pray; he does not stand at that distance which those are at, who live without God in the world, but has a name among the people near unto him. They honour him; that is, they take on them to honour God, they join with those that do so. Some honour God has even from the services of hypocrites, as they help to keep up the face and form of godliness in the world, whence God fetches honour to himself, though they intend it not to him. When God's enemies submit themselves but feignedly, when they lie unto him, so the word is, (Ps. 66. 3.) it redounds to his honour, and he gets himself a name.

Secondly, Where he rests and takes up; this is done but with his mouth and with his lips. It is piety but from the teeth outwards; he shows much love, and that is all, there is in his heart no true love; they make their voice to be heard, (Isa. 58. 4.) mention the name of the Lord, Isa. 48. 1. Hypocrites are those that only make a lip-labour of religion and religious worship. In word and tongue, the worst hypocrites may do as well as the best saints, and speak as fair with Jacob's voice.

Thirdly, What that is wherein he comes short; it is in the main matter; Their heart is far from me, habitually alienated and estranged, (Eph. 4. 18.) actually wandering and dwelling upon something else; no serious thoughts of God, no pious affections toward him, no concern about the soul and eternity, no thoughts agreeable to the service. God is near in their mouth, but far from their reins, Jer. 12. 2. Ezek. 33. 31. The heart, with the fool's eyes, is in the ends of the earth. It is a silly dove that is without heart, and so it is a silly duty, Hos. 7. 11. A hypocrite says one thing, but thinks another. The great thing that God looks at and requires, is, the heart; (Prov. 23. 26.) if that be far from him, it is not a reasonable service, and therefore not an acceptable one, it is the sacrifice of fools, Eccl. 5. 1.

[2.] In their prescriptions to others. This is an instance of their hypocrisy, that they teach for doctrines the commandments of men. The Jews then, as the Papists since, paid the same respect to oral tradition that they did to the word of God, receiving it pari pietatis affectu ac reverentiâ—with the same pious affection and reverence. Conc. Trident. Sess. 4. Decr. 1. When men's inventions are tacked to God's institutions, and imposed accordingly; this is hypocrisy, a mere human religion. The commandments of men are properly conversant about the things of men, but God will have his own work done by his own rules, and accepts not that which he did not himself appoint. That only comes to him, that comes from him.

(2.) The doom of hypocrites; it is put in a little compass; In vain do they worship me. Their worship does not attain the end for which it was appointed; it will neither please God, nor profit themselves. If it be not in spirit, it is not in truth, and so it is all nothing. That man who only seems to be religious, but is not so, his religion is vain; (James 1. 26.) and if our religion be a vain oblation, a vain religion, how great is that vanity! How sad is it to live in an age of prayers and sermons, and sabbaths and sacraments, in vain, to beat the air in all these; it is so, if the heart be not with God in them. Lip labour is lost labour, Isa. 1. 11. Hypocrites sow the wind and reap the whirlwind; they trust in vanity, and vanity will be their recompense.

Thus Christ justified his disciples in their disobedience to the traditions of the elders; and this the Scribes and Pharisees got by their cavilling. We read not of any reply they made; if they were not satisfied, yet they were silenced, and could not resist the power wherewith Christ spake.


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To-day we meet together in fulfilment of the express wish of Harvey, our illustrious benefactor, and most distinguished ornament, and it is my duty " to commemorate the benefactors of the College and to encourage its members to search out the secrets of nature by way of experiment."

I will not apologise for endeavouring to perform this duty, imposed upon me by our past President, heartily though I wish it had fallen into worthier hands. As a duty I accepted the task; it is made a pleasant one by the feeling that, in commemorating the achievements of the past, I shall have the sympathy of my audience; and if by pointing to the direction in which further advances are possible, and suggesting routes by which these advances may be made, I can stimulate and encourage any here present to search out these secrets of nature, I shall feel that the very deep anxiety with which I undertook to address you has not been altogether fruitless.

And what are the achievements of the past? and of the

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8 present? Is disease being prevented? Is life being prolonged? Is pain lessened? When disease arises can it be more skilfully- treated or more rapidly controlled? It is almost superfluous for me in this assembly to answer these questions or to point out how intimately our progress has been associated with and dependent upon Harvey's great discovery. As illustrations, need I speak here of the diminished mortality from consumption, which, by the recognition of and attention to ordinary sanitary laws, has during the last quarter of a century been reduced in England and Wales 28 per cent.? or of the diminished mortality from ague or from typhoid fever? Is pain lessened? Need I refer to ether and chloroform, or to nitrite of amyl which is now finding a more extended use than in simply relieving angina pectoris; or to the hypodermic injections of remedies such as morphia and ether? When disease arises can it be more skilfully treated or more rapidly controlled? Need I speak of the effects of the bromides I in epilepsy and allied disorders; of the specific effect of quinine in ague, or of the equally specific effect, in proper doses and with suitable diet, of the salicyl compounds in acute rheumatism; of the diminished mortality from pneumonia; of the use of the aspirator in pleuritic and pericardial effusions; of our increased skill in the localisation of cerebral disease and the brilliant results which are now achieved by surgery in connection there-with? All these are modern advances of which we may well be proud. The names of those, many of them happily still living among us, to whom we owe this increased knowledge, are known to you all. It is unnecessary therefore to commemorate singly those distinguished Fellows of this College whose names connected with the advance of medicine will be cherished by posterity not only as Benefactors of this College, but of mankind at large.

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9 And what shall I say of our greatest Benefactor whose memory we specially commemorate to-day? When I turn to the orations delivered by my predecessors, I find that the history of Harvey's life, his surroundings, his mode of investigating nature, his early studies, classical, dialectical, and physical, his habit of inductive reasoning, the steps leading to his great discovery, the grounds for asserting his rightful claim to be the discoverer, have all been so eloquently discussed and so exhaustively displayed before you, that it would be out of place for me to dilate on any of these themes. Permit me rather to picture before you to-day some of the discoveries which have been made in modern times, in matters connected with the circulation, and more particularly as regards some of the changes in the blood which may be associated with or productive of disease, and thus to indicate some of the additions to that fabric of scientific medicine of which Harvey's great discovery is the corner stone.

Following upon the labours of Harvey, we note the discovery of the capillaries by Malpighi, about 1687, our knowledge thereof improved by Leeuwenhoek in 1729 and then by Hales, Cowper, Haller and Lieberkuhn, and perfected by Prochaska in his publication in 1812. Subsequently we learned how the rhythm of the heart may be interfered with by causes acting through the nervous system, and how the calibre of the minute arteries may be modified through the same agency. Then we have the changes connected with inflammation; and can we not picture to ourselves with what special interest such an observer as Harvey would have watched the changes which take place in the vessels and the surrounding tissues following upon irritation or inflammation; and which, by the aid of those appliances with which modern science has furnished us, have been discovered in recent

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10 times? I refer to the dilatation and relaxed condition of the vessels, the slowing of the blood stream, the falling out of the colourless corpuscles, like tired soldiers on the march, as Professor Burdon Sanderson has expressed it, their leaving the mid-stream and loitering against the vein wall, afterwards sticking to it, and then in some wonderful way wandering out, emigrating through the unbroken vascular wall into the surrounding space, some of them becoming disintegrated and dissolved in the liquid which is also effused, and so leading to an accumulation of coagulable lymph or inflammatory exudation external to the vessels. How much is there in these phenomena which still requires investigation and explanation! Why do the blood-vessels dilate 1 how is the emigration of the colourless corpuscles to be explained 1 by what means also, do these corpuscles " penetrate into dead tissue and indeed into any material capable of imbibition with which they are brought into contact in an active state '"2 And then the further questions may be suggested: Does there exist an antagonism or attraction between these white corpuscles and those recently discovered organisms the bacilli? Is there a struggle for existence between them 1 How are the powers, and action, and growth of the colourless corpuscles modified by the presence of these micro-organisms? What part do the latter play in the production of disease? Is it true that a large part of all health and disease in the world is dependent upon them? Such questions as these indicate the degree of importance which must be assigned to the discovery of these bodies, and account for the interest in them which prevails at the present time. Probably no other discovery since that of the circulation of the blood ap})ears to be so full of promise in elucidating the causes and courses of some diseases as this one.

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11 These micro-organisms in various forms seem to take part in the destructive changes, with which we are familiar in the animal and vegetable world, they are found in connection with certain diseases, and some of them have their home in the circulatory apparatus. Is it not then peculiarly fitting that on an occasion like this some reference should be made to these micro-organisms 1 We can rightly commemorate and rejoice over the work which has been done in this direction, whilst we feel at the same time how much there is still unsettled and obscure. The knowledge gained from the experimental observations on animals is as yet applicable only within very narrow limits to the human subject. Nay more, the results of clinical observation are altogether inconsistent in many cases with what these experiments would suggest; and yet how fruitful and full of promise does the territory seem from our present stand-point! Is it not one to which I may point encouragingly and ask you to explore it, and bid you, in Harvey's words, "search out its secrets by way of experiment"?

Let me briefly remind you of some of the facts which have been made out regarding these bodies.

There can be little doubt that in some disorders these organisms in their various forms, round, corkscrew or straight-rod shaped, are the causal connection, the virus, of the disease. The bacilli are constantly present in the affected parts, the organisms have been cultivated outside the body, and separated from all the morbid materials, and the disease has been produced by the introduction of these cultivated organisms into healthy animals. As examples of such disorders we have, as described by Koch, anthrax or splenic fever, a septicaemia in mice due to bacteria, and a septicaemia in rabbits due to micrococci. An

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12 animal inoculated with the smallest drop of anthracic blood, provided it contains bacilli or their spores, dies within 24 or 36 hours—and then in the capillaries of the liver, spleen, lungs, kidneys and stomach incredible numbers of these bacilli can be seen permeating this portion of the vascular system, whilst in the larger vessels even in the arteries and veins of an intestinal villus they may be entirely absent or only seen at long intervals—and it is remarkable that in the capillaries of the brain, skin, muscle and tongue there are fewer than elsewhere. The development of such numbers in so short a time appears almost incredible. The bacillus subtilis however, which is not parasitic, but otherwise very much like bacillus anthracis in all respects, with a good supply of food and oxygen and a temperature of 30" C. (86" F.), doubles its length and divides once every thirty minutes, forming two separate organisms. By an easy calculation therefore, we find that at the end of twenty-four hours the progeny of such a bacillus increasing at such a rate, would amount to upwards of eight hundred millions of millions.

In anthrax it would seem to be quite clear, then, that the bacillus will give rise to the disorder. There can be little doubt also that woolsorters' disease, malignant pustule, and intestinal anthrax in the human subject are developed from the same source.

As an example of a disease connected with a spirillum or spirochaeta we have that of relapsing fever; a disorder in the spread of which it is certain, that contagion from the sick or through the intervention of articles of daily use plays a very important part. During the febrile condition of the patient, a slender thread-like and twisted organism, which is never vistill, but always moving about in various directions, is found

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13 in great numbers in the blood—the Spirochaeta Obermeieri—closely resembling the innocuous Spirochaeta Cohnii or plicatilis found in the mucus of the teeth. During the intervals between the febrile attacks none of these organisms can be detected in the blood. Outside the body they show active movements at a temperature of 60" or 70", become languid at blood heat and die at fever heat. The pyrexia therefore of the patient is supposed to destroy the organism, which then breaks up into a number of minute granules, some of which may constitute the spores from which fresh crops of the organism may develope. If blood containing spirochsetse is taken from a patient during the stage of pyrexia and human beings or monkeys inoculated with it, the disease can be reproduced, but not by blood taken during the intervals between the febrile attacks. Injections of the blood into other animals such as dogs, rabbits and guinea-pigs were always without result. All attempts to cultivate the organism outside the body have as yet been unsuccessful, so that we really know very little of its history.

Here again we have a disorder associated with a bacillus, the organism disappearing and reappearing from the system and the blood of the infected animal being intermittent in its power of communicating the disease to other animals.

Perhaps few disorders of the human frame have greater interest attached to them than those associated with tubercle, and when we remember that one-seventh on an average of the deaths of human beings result from pulmonary tuberculosis, the importance of any fresh light shed on this disorder, or the discovery of any new fact can not easily be overestimated. The discovery, then, by Koch in 1882 of a bacillus in the tubercular diseases of man and animals has necessarily attracted a good deal of attention and led

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14 to a good deal of discussion. These rod-shaped bacilli have been shown to exist, in all cases of human tuberculosis, in the sputum, in caseating scrofulous glands, and in the tubercular masses in the lungs. Pure cultivations of these bacilli when introduced beneath the skin of susceptible animals such as rabbits, guinea- pigs, cats, and field-mice, always produce after three, four, or more weeks, the typical tubercular lesions; swollen lymphatic glands, deposits in the spleen, liver, and lungs, and enlargement and caseation of the bronchial glands. Different species of animals present very different degrees of susceptibility; the domestic mouse is not easily affected, whereas the field-mouse is highly susceptible; and as eveiy practical physician knows, in certain families of the human species there is an unmistakable liability, an inborn tendency to suffer from tuberculosis, whereas other families entirely escape. Wherein lies this great difference of susceptibility"? In what way do the micro-organisms either in tuberculosis or anthrax or relapsing-fever influence the economy? how do they produce the disease? Why should some animals resist their power and others be overwhelmed by them? Recent investigations seem to me to throw some light on these points, and in some degree to answer these questions.

When certain forms of bacilli, of the so-called non-pathogenic character, are introduced into the blood of the lower animals, even in large numbers, their existence is of comparatively short duration, and they speedily disappear. The living blood has the power of destroying them. In three hours according to Wysso-kowitsch none are present even though enormous numbers are injected. They are deposited in the liver, spleen, and medulla of bone, and soon die if they do not contain spores. If spores are injected these live much longer, those of bacillus subtilis being still

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15 alive after three months. But there is another way in which they are destroyed. "When bacteria are injected into the tissues there follows a strusgle for existence between them and the cellular elements. Leucocytes quickly accumulate in the neighbourhood of the mass of bacteria, and then there follows a light for the mastery between these cells and the bacteria. The cells take up the bacteria into their interior, and where the bacteria are non- pathogenic for the animal employed they are destroyed" (Cheyne). The discovery of this is due to Metschnikoff. It is well known that the colourless blood-cells possess the power of constantly changing their shape, exhibiting undulatory movements and alternate protrusion and retraction of processes; they are also able to take up and absorb solid bodies into their soft substance. "If the foreign body comes into contact with the surface of the cell, the latter puts out processes which embrace it and gradually close over it as the waves close over a drowning animal, so that it lies at last inside the soft cell substance. It may be cast out again at some future time, but it may also suffer decomposition inside the cell, be killed and disappear." These well-known facts led Metschnikoff to investigate the behaviour of the colourless blood cells of the vertebrate animals towards the bacillus of anthrax, "He found that the virulent rods when introduced by inoculation into an animal liable to take the fever, such as a rodent, were not absorbed by the blood cells, or only in exceptional instances. They were readily absorbed by the blood-cells of animals not liable to the disease, as frogs and lizards, provided the temperature was not artificially raised, and then disappeared inside the cells. The same thing happened when susceptible animals were inoculated with bacillus anthracis which had been attenuated to the harmless state." Metschnikoff therefore assumed "that the bacillus

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16 is harmless because it is absorbed and desti-oyed by the blood-cells, and injurious because this does not happen; or at least that it becomes harmless if the destruction by the blood-cells takes place more rapidly and to a greater extent than the growth and multiplication of the bacillus, the converse being also time." If in the case of frogs, the temperature be raised, "thus favouring the growth of the bacilli and at the same time lowering the vitality of the cells, the bacilli grow and penetrate into the circulating blood."

If, however, the bacilli when introduced into the blood or into the tissues are not destroyed by the colourless blood-cells or otherwise, but are such as are able to live in the blood or tissues of living animals, what is the nature of the change which they produce? It appears that among the products which result from the decomposition of organised matter and are associated with the growth of bacteria, certain chemical poisons appear, which are capable of destroying animal life. We have long been familiar with the fact that the micrococcus or bacillus lacticus is the agent by which the lactic acid fermentation of the sugar contained in milk takes place, and that this lactic acid being neutralised with lime or other substance, will, after a time, through the agency of another micro-organism, probably the bacillus amylobacter, undergo a further change or fermentation, and be converted into butyric acid, with the simultaneous evolution of carbonic acid and hydrogen.

(OH 2C,H^-^ = C3H, . COOH + 2C0, + 2H,.

(COOH butyric acid lactic acid

And there are other fermentations of a similar character. But it is only in recent times that it has been discovered that, as

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17 the result of albuminous or proteid decomposition or putrefaction, certain animal alkaloids are produced, similar in their nature and in their chemical composition to the vegetable alkaloids. Some of these products, or ptomaines as they are called, are innocuous, others possess poisonous properties varying in degree from the slighter forms to the most intense activity. Nearly 70 yeai-s ago Kerner pointed out the similarity of the effects produced by sausage-poison to those produced by atropine, but the symptoms are slower in appearing—sometimes two, three, or four days may elapse before they manifest themselves. Dr Alfred Swaine Taylor mentions the fact that in 1859 sixty-four persons suffered from the poisonous effects of a certain batch of sausages, only one case however proving fatal. Chemical analysis of the sausages yielded nothing of a poisonous nature, though there could be no doubt that they had caused the symptoms and death. The symptoms were—burning in the throat and stomach, followed by vomiting and purging; giddiness and confusion in the head, and in some cases delirium.

It might now possibly be urged, with our present knowledge, that the symptoms arose from the formation of an animal alkaloid in the meat, developed through the agency of such an organism as Cohn's bacterium termo or Bienstock's drumstick bacillus.

From partial decay, through the agency of Tyrothrix tenuis or some other bacterium, cheese sometimes acquires irritant properties and will give rise to vomiting and purging more or less violent in those who have eaten it.

Pickled or tinned salmon, salted herrings and even fresh mussels, are examples of articles of diet which have caused poioonous symptoms in those who have partaken of them.

In 1856 Panum showed that these effects were the result of

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18 some chemical poison developed in putrefying material. He subjected the fluids to prolonged boiling so as to destroy any living organisms, and on injecting it into animals the poisonous effects were still produced though in a slighter form than from the unboiled fluid. Further, after filtering the fluid and boiling it for an hour he evaporated it to dryness, then digested it with absolute alcohol and treated the residue with boiling water. This watery extract also was poisonous. Some of these chemical substances or animal alkaloids were separated by Armand Gautier in 1872 and by Professor Selmi of Bologna and named by him ptomaines. Professor Brieger has since succeeded in producing these bodies, and some not poisonous, in a crystalline form, and in determining their chemical composition. The following are some of them :

Neuridin OgHj^Ng, a non-poisonous alkaloid, is the one which is most constantly present at the commencement of putrefaction and which appears in largest quantity. This substance can be split up into dimethylamine and trimethylamine:—

C,H,A + H, = NH (CH3), + N(CH3)3 neuridin dimethylamine trimethylamine.

After the removal of this from putrefying flesh two poisons can be extracted, neurin C^HjgNO and cholin 0,11, ^NO^, difieringonly in composition by a molecule of H^O, but the neurin being ten times more poisonous than cholin; which latter exists normally in the bile, and as a constituent of lecithin in the brain, and in yolk of egg. From putrefying fish, and gelatine, muscarine CgHj^NOg is obtained; an alkaloid previously discovered by Schmiedeberg and Koppe, as the poisonous agent in a disease of flies caused by a fungus, the agaricus muscarius. Brieger also obtained other substances from decomposing albuminous substances and human corpses, viz. ethylene diamine C^H^ {NHj,)j,, gadinin 0^11,^0,,

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19 trimethylamine N (0113)3, dimethylaniine NH (0113)2 and tri- ethylamine N (C^HJg, cadaverin C^H^gN^, putrescin C^Hj^N^, saprin C^Hj^N^ and mydalein. The amount of these substances obtained depending upon the stage of decomposition and the temperature at which it took place. I will not stop to describe the poisonous effects of these products' on the system. For that I must refer you to Professor Brieger's publications or to Dr A. M. Brown's treatise on the animal alkaloids. The point of interest is that they are developed during the process of putrefaction in which bacilli take an active part; and probably it is from the development of these poisons that the effects on the animal system are produced when certain of the micro-organisms gain an entrance into it. It is to be observed, that these poisons are developed by the action of bacilli on dead or effete animal matter; not necessarily on living tissue; and it might be suggested therefore that if they are produced from living tissues by the microorganisms, this can only take place when the tissue has lost its so-called vitality or when there is a departure in the tissue from the normal condition which constitutes health. But this will hardly apply to such a disorder as splenic fever, or even to tuberculosis in guinea-pigs, &c., in which cases we have very clear evidence that the introduction of the pure cultivated microorganism into healthy animals will produce the disease. This at once suggests the question, Can the apparently innocuous or non-pathogenic bacteria be so cultivated outside the body as to develope an intense virulence and become pathogenic — endowed, that is, with the power of growing and multiplying within a living animal 1 To this I will briefly refer later on.

Now, not only has it been demonstrated that certain poisons or ptomaines can be derived from dead putrefying animal sub-

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20 stances, but, moreover it has been shown by Gautier that certain alkaloids which he terms leucomaines, having poisonous properties, are formed within the living organism and independently of the action of bacteria—waste or effete debris—by the accumulation of which in the system the vital processes are arrested. As examples of these he gives betain, guanin, xanthin, kreatinin &c. The accumulation of these substances in the system is prevented either by their destruction by oxidation, or by their elimination through the agency of the kidneys and liver. That products are formed in the living body which, if not eliminated, produce poisonous effects is well shown in cases, for example, of uraemia, gout or diabetes. The majority of observers are of opinion that uraemia is not solely due to the effect of an excess of urea or of ammonium carbonate in the blood, but to the poisonous action, in addition, of such substances as kreatin, kreatinin and other extractives or waste materials which have accumulated in the system from defective excretion by the kidneys. In gout we have uric acid exerting its poisonous effects on the nervous centres, and modifying the nutrition of parts of the body. In diabetes we have not only in some cases the formation of glucose taking place in the system, even when saccharine and starchy foods are withheld, but we have also evidence of some abnormal molecular change in the constitution of the tissues, as shown by the marked tendency to carbuncle and to tuberculosis of the lungs. As the disease advances we have symptoms of drowsiness showing themselves, the result of some abnormal product in the blood acting on the nervous system; later on acetone appears in the urine, and in general, not long after this stage has been reached death takes place. In the Croonian lectures for 1886 I endeavoured to show that there were grounds for regarding living albuminous compounds as made

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up of certain cyan-alcohols united to a benzene nucleus — or in other words by combining hydrocyanic acid with a compound belonging to the benzene group and with the five aldehydes — methylic, ethylic, propionic, butyric and valeric — a compound would be formed having the same ultimate composition as albumen; and also that a considerable number of the substances such as glycocoll, lactic acid, leucine &c. which are obtained from albuminous substances, could be prepared in the laboratory artificially from these cyan-alcohols. Assuming such a constitution for albumen, I indicated how, if the force, vital or other, which holds to- gether these molecules forming living tissue, were modified or lessened, so that the molecules instead of undergoing the normal changes fall asunder and are partially oxidised, such substances would be produced as glucose fi'om methylic cyan-alcohol, lactic acid and para-aldehyde from the next in the series, and oxybutyric acid and acetone from a third. I refer to this here, because the same assumption as to the constitution of albuminous material helps to explain the origin and formation of Brieger's ptomaines.

From the lowest cyan-alcohol in the series CH^ l p„ glycocoll

CH„ ^^^^TT should be obtained, which under certain conditions

splits up into carbonic acid and methylamine NH2(CH3). This methylamine may under certain circumstances form dimethylamine NH(CH3)2 and trimethylamine N(0H3)3, the two substances into which neuridin (the alkaloid which is the first to be sepai*ated from putrefying meat) can be decomposed. The following equation then would represent the origin of neuridin : —

5CH,(NHJC00H = C,H,^N, + 5C0, + 3NH3 + H, glycocoll neuridin.

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If now we take trimethylamine and combine it with the next cyan-alcohol in the series, the ethylic, cholin should be the result —

[OH /OH

N(0H3)3 + C,hJ +H,0 =C,h' +HCN

VCN In(CH3)30H

trimethylamine ethylic cyan-alcohol cholin,

for cholin has been formed synthetically in the laboratory by

roH

heating ethylene chlorhydrin C^H^j with trimethylamine,

and the same reaction should hold good for the cyan-hydrin or cyan-alcohol.

Neurin differs from cholin by H^O, and the former can be obtained by heating cholin with hydriodic acid and then acting upon it with moist silver oxide : —

rHO (OH

c,hJ =c^bA +nfi

In(CH3)3.H0 ^N(CH3)3

cholin neurin.

By oxidising cholin (by gently heating its hydrochloride or

platino-chloride with strong nitric acid) we obtain muscarine : —

(HO ((OH),

CAl +o = ch,.ch]

^N(CH3)3.H0 In.(CH3)3.0H

cholin muscarine hydroxide.

Oxidised in a different fashion cholin is converted into betain,

the alkaloid of beet root : —

(HO /CO

C^hJ -(-0 = CH2«^ +H2O

In(CH3)3H0 'n(CH3)30

cholin betain,

a substance which has also been found, by Liebreich, in the human urine.

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23 Such facts as these lend some support to the view which I have advanced as to the constitution of albumen, and I mention them here in order again to call the attention of those interested in chemical physiology to the close relationship which exists between these compounds of prussic acid with the various aldehydes, or the cyan-alcohols, and the different substances which can be extracted from albuminous tissues.

Let me now return from this digression.

From the data which I have placed before you, I wish to draw the inference that in the living animal organisms, owing to slight departures from the normal nutrition of parts, arising probably through nervous agency— the trophic nerves—various substances such as extractives or alkaloids, will be produced, which if not eliminated or neutralised, will lead to pathological changes in the system, absolutely and entirely independently of any bacterial action.

As an illustration I would refer to the pyrexia or fever which, even in healthy individuals, may follow over exertion or excessive fatigue, and which is still more readily developed in convalescents or in persons who are not very strong. Sir William Aitkin has directed special attention to this condition "which is constantly seen in all forms of physical overtaxation or over exertion, as in a prolonged march or by excessive drill, especially in young and adolescent soldiers"—and he refers to the investigations made by Professor Angelo Mosso of Turin on the physiology of fatigue as developed in the soldiers of the Italian army and the pathological manifestations which accompany it. "Fatigue carried beyond the moderate stage, at which it is decidedly beneficial, subjects the blood to a decomposing process through the infiltration into it of substances which act as poisons—substances which when

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 Magician taught that the Father, the Son, and the Holy Ghost were only manifestations and forms of the self-same person, and that the one God, in the capacity of Father, had revealed himself to the Samaritans; in the capacity of the Son, as Christ, to the Jews; in the capacity of the Holy Ghost, to the pagans; (b) in the second century, Praxeas affirmed that one and the same God, as concealed in himself, was the Father, but as having appeared in the work of creation and later, in the redemption, was the Son Christ; (e) in the third century, Noetus, who also recognized the Father and Son as one person, one God, who had become incarnate and had suffered torment and death; Sabellius, who had taught that the Father, the Son, and the Holy Ghost were only three names, three actions (ἐνέργεια) of one and the same person, God, who had been incarnate and had suffered death for us; and Paul of Samosata, according to whose words the Son and the Holy Ghost were in God, as mind and strength were in man; (d) in the fourth century, Marcellus of Ancyra and his disciple Photinus: they preached, after Sabellius, that the Father, the Son, and the Holy Ghost were only names of the selfsame person in God, and after Paul of Samosata, that the Son, or the Word, was the mind of God, and the Holy Spirit, the power of God.” (pp. 162 and 163.)

Here is the conception of other heretics:

“The common idea of all these was that although the divine persons, the Father, the Son, and the Holy Ghost, were of one substance, they were not one in substance, and that they had one nature, but had it each separately, as, for the example, three persons of the human race, and so were three Gods, and not one God.” (p. 163.)

Without having the question answered whether the teaching of the heretics was true or false, I am unable to say that I understand what they have been saying. Similarly, without entering into a discussion as to whether


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 it is right that God should be one and three, I am unable to say that I understand what it means, although the dogma is expounded in all its fulness, as the author avers. In all its fulness the dogma is expounded as follows:

“‘Let us worship the one God in the Trinity and the Trinity in the One, neither blending the hypostases, nor separating the essence.’ Neither blending the essence, that is, recognizing the Father, the Son, and the Holy Ghost not merely as three names, or forms, or manifestations of the selfsame God, as the heretics have represented him, nor as three attributes, or forces, or actions, but as three independent persons of the Deity, since each of them, the Father, and the Son, and the Holy Ghost, possessing a divine mind and the other divine attributes, has his own, personal properties, ‘for one is the hypostasis of the Father, another, of the Son, and still another, of the Holy Ghost.’ Nor separating the essence, that is, affirming that the Father, the Son, and the Holy Ghost are one in essence, exist inseparably one in the other, and, differing from each other only in their personal attributes, have an identity of mind, will, and all the other divine attributes,—not at all as there exist three entities of any class of beings among the creatures, entities that have one nature. ‘Among the creatures,’ let us speak with the words of St. John Damascene, ‘the common nature of the entities is perceived only by the mind, for the entities do not exist one in the other, but each separate and distinct, that is, in itself, and each has much to distinguish it from the others. They differ in place and time, in disposition of the will, in firmness, in external appearance or form, in habits, in temperament, in worth, in the manner of life, and in the other distinctive properties, but most of all, because they do not exist one in the other, but each exists separately. For this reason we say: two, three, many men. But in the holy, transubstantial, all-surpassing, incomprehensible Trinity we see something different. Here the universality


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 and unity are viewed in fact according to the coeternality of the persons, according to the identity of the essentiality, activity, and will, according to the concord of definitions, according to the identity—I do not say similitude, but identity—of power, almightiness, and goodness, and according to the one tendency of motion—Each of the hypostases has a unity with the other, not less than with itself; that is, the Father, the Son, and the Holy Ghost are one in all respects but ungeneratedness, birth, and derivation, and are divided only in our ratiocination (ἐπίνοια). For we know only one God, and only in the properties of fatherhood, sonhood, and derivation do we present a difference—In the unlimited Deity we cannot assume, as in us, spatial distance, because the hypostases exist one in the other, but in such a way that they are not blended, but united, according to the words of the Lord: I am the Father, and the Father in me (John xiv. 11); nor distinction of will, definitions, activities, power, or anything else, which in us produce a real and complete division. Therefore we recognize the Father, the Son, and the Holy Ghost not as three Gods, but as one God in the Holy Trinity. The whole incomprehensibility of the mystery of the Most Holy Trinity consists precisely in this, that the three independent persons of the Deity are one in essence and entirely inseparable; if they existed separately one from the other, like three entities among the creatures, there would be nothing incomprehensible in that. ‘The Deity is one and three: oh, most glorious transformation!’ What is united in essence is divided according to the persons: the indivisible is divided, what is one is trebled: that is the Father, the Son, and the living Spirit, preserving all.” (pp. 164 and 165.)

So here it is, all the doctrine, all the God-revealed truth, revealed to me in all its fulness for the sake of my salvation. “The Deity is one and three. Oh, most glorious transformation!” The exposition and explana-


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 tion are ended, and there will be nothing else. And this through the mouth of his church says God the Father to me, his son, who with all my power am looking for truth and salvation! To my entreaty and tears of despair he replies to me: “The indivisible is divided, what is one is trebled: that is the Father, the Son, and the living Spirit, preserving all.” And to the demands of my reason, which has been given me for the comprehension of God, there is no other answer. I cannot say, nor can any one else say, that I have comprehended it, and so I cannot say that I believe. With my tongue I can say that I believe that “what is one is trebled. Oh, most glorious transformation!” But when I say that, I am a liar and an atheist, and it is precisely this that the church demands of me, that is, those people who assert that they believe in it. But that is not true: they do not believe and nobody has ever believed it. What a marvellous phenomenon! Christianity will soon have existed for a thousand years in Russia. For a thousand years the pastors have been teaching their flocks the foundations of the faith. The foundation of the faith is the dogma of the Trinity. Ask a peasant, a country woman, what the Trinity is. Out of ten hardly one will answer you. It cannot be said that that is due to ignorance. Ask them what the teaching of Christ consists in. Everybody will tell you. And yet the dogma of the Trinity is not complicated or long. Why, then, does no one know it? Because it is impossible to know what makes no sense.

Then there follow proofs that these truths, that is, that God is a Trinity, have been revealed by God to all men. The proofs are divided into proofs from the Old and the New Testament. In the Old Testament, which forms the teaching of the Jews, of those Jews who regard the Trinity as the greatest blasphemy, in this Old Testament do they look for proofs that God has revealed his three-fold nature to men. Here are these proofs from the Old


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 Testament: (1) Because God said, “Let us make,” and not “Let me make:” that was so because he spoke with his Son and the Holy Ghost. (pp. 165, 166.)

(2) Because he said, “Adam, one of us.” By “us” are meant the three: the Father, the Son, and the Holy Ghost. (3) The Bible says: “Let us confound their language,” and not, “Let me confound;” consequently the three Gods wanted to confound it. (4) Because three angels came to Abraham,—those were the Father, the Son, and the Holy Ghost, who came to see Abraham. (pp. 169, 170.)

(5) Because in the Book of Numbers it is commanded that the word “Lord” should be repeated three times. (6) Because in David’s Psalter it says, “Their whole host.” “Their” proves the Trinity. (7) A proof of the Trinity is found in the fact that Isaiah said three times, “Holy, holy, holy.” (8) Proofs are found in all those passages of the Old Testament where the words “son and spirit” are used (Psalm ii. 7; Is. xlviii. 16, xi. 2, lxi. 1; Job xxxiii. 4). “The Lord hath said unto me, Thou art my Son; this day have I begotten thee. The Lord God, and his Spirit, hath sent me, and the Spirit of the Lord shall rest upon him,” and so forth. Those are all the proofs from the Old Testament. I have not omitted a single one. The author sees himself that the proofs are poor, and that it is possible to find as many or even more proofs in any book you please, and so he thinks it necessary to give explanations. Later on he says:

“And why they are not entirely clear, why it has pleased God to disclose in the Old Testament the mystery of the Most Holy Trinity only to a certain degree,—that is concealed in the plans of his infinite wisdom. The godly teachers assumed for this two main causes: (a) one lay in general in the property of human nature, which was limited and impaired, and had to be led to the knowledge of the highest mysteries of revelation only by


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 But as all that was sung in Tragedy was, according to Aristotles Expression, call'd the Chorus in the Singular Number; and yet its being in the Singular was no reason why each part (when it was divided into several) should not be call'd the Chorus too; and so several Choruss be introduc'd: just so in the Episode, each Incident, and each part of the Fable and the Action, is not only stil'd a part of the Episode, but even an Entire Episode. 'Tis in this sense that Aristotle said, the Madness of Orestes, and his Cure by Expiatory Sacrifices, were two Episodes. This Term taken in this sense signifies each part of the Action exprest in the Model, and first Constitution of the Fable; such as the Absence and Travels of Ulysses the Disturbance of his Family, and his Presence which re-adjusted all things.

Aristotle tells us of a third sort of Episodes, when he says, that whatever is comprehended and exprest in the first Platform of the Fable is Proper, and the other Things are Episodes. This is what he says just after he had propos'd the Model of the Odysseïs. We must then in the Odysseïs it self examine what this third sort of Episode is, the better to know wherein it differs from the second. We shall see how the Incidents he calls proper, are absolutely necessary: and how those, which he distinguishes by the Name of Episodes, are in one sense necessary and probable; and in another sense not at all necessary, but such as the Poet had liberty to make use of, or not.

After Homer had laid the first Ground-work of the Fable, and prepar'd the Model, such as we have observ'd it to be, it was not then at his Choice to make or not make Ulysses absent from his Country. This Absence was Essential: Aristotle stiles and places it among those things that are proper to the Fable. But the Adventure of Antiphates, that of Circe, of the Sirens, of Scylla, of Charybdis, &c. he does not call such. The Poet was left at his full liberty to have made choice of any other, as well as these things. So that, they are only probable, and such Episodes as are distinct from the main Action, to which in this sense they are neither proper nor necessary.

But now let us see in what sense they are necessary thereto. Since the Absence of Ulysses was necessary, it follows, that not being at home, he must be somewhere else. Though then the Poet had his liberty to make use of none of these particular Adventures we mention'd, and he made choice of; yet had he not an absolute liberty of making use of none at all: but if he had omitted these, he had been necessarily oblig'd to substitute others


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24 injected into the circulation of healthy animals, induce malaise and all the signs of excessive exhaustion."

In convalescence from disease, too, how readily does the evening temperature rise after any slight physical exertion; and at the commencement of typhoid fever perhaps nothing tends to intensify the severity of the attack so much as physical fatigue. It would seem in this case as if the soil for the cultivation of the fever germ was materially enriched by the products of disintegration.

In "fatigue fever" these products are formed more rapidly than they can be eliminated or neutralised. With rest the febrile condition soon passes off, if the individual is otherwise healthy. Now it appears to be the function of certain glands besides the liver and kidneys, to get rid of the poisonous products resulting from the disintegration of the tissues, either by neutralising or decomposing them or otherwise. If the action of the glands is checked or modified either by disease or by their removal, the poisonous material soon begins to exert its specific effect on the system. We have recently been taught that following upon disease or removal of the thyroid gland the condition known as Myxoedema, with all its attendant phenomena, arises. Again in disease of the suprarenal capsules "efiete pigments and efiete proteids circulate in the blood; the former or their incomplete metabolites, producing pigmentation of skin and mucous membrane, and appearing often in the urine as urohsematoporphyrin; the latter producing toxic effects, and leading to further deterioration of the blood with its consequences " (McMunn). If, then, from any cause due to glandular, nervous, or other derangement in the system, these poisonous substances are developed or not eliminated they will alter the

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25 composition and constitution of the blood; the white corpuscles may be destroyed, or their movements enfeebled, and, by any such changes, the blood, which previously could resist the attacks of the various parasitic microorganisms, is so modified as to render it a suitable soil in which these organisms may develope and thrive. This view is confirmed by the experiments of Rossbach and Rosenberger, who found that when papain or sterilised septic blood was injected into the vessels, micrococci developed in the blood with extraordinary rapidity. The blood, that is to say, was so modified in character that the micrococci which could gain no entrance previous to the injection of papain, afterwards found a congenial soil for their development.

We may take another illustration from the process of fermentation. By fermentation sugar can be converted into carbonic acid and alcohol; but a pure saccharine solution does not ferment on the addition of a small quantity of fungi or bacteria in a pure state. Some nitrogenous material must be added as well, to act as food to the organisms, and then the transformation into carbonic acid and alcohol commences.

That it is only in particular conditions of a tissue, or at special times in its growth, that it furnishes suitable soil for the growth of the bacilli is shown by the following illustration from the vegetable world, furnished by de Bary:—

"The common garden-cress Lepidium sativum, is often attacked by a parasitic fungus of comparatively large size, Cystopus candidus. In consequence of this it shows considerable degeneration, swellings, curvatures of the stem, and often also of the fruits, and on these parts and on the leaves white spots and pustules subsequently turning to dust, which are formed by the sporogenous organs of the Cystopus, and give the entire pheno-

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26 menon the name of the white rust in cress. This is a case of disease, and so striking that every one notices it at once with the naked eye. Now we find in a bed of cress at about flowering time a certain number of rusty plants, two for example or twenty. They are in the middle of the other hundred or thousand plants, and these are healthy and free from the fungus and continue so till the period of vegetation is at an end. This is the case, though the Cystopus forms countless spores in the white rust-pustules, and the spores are dispersed as dust and are at once capable of germination, finding the necessary conditions for their further development in the bed of cress, and are the instruments by which the white rust-disease is eminently infectious. Nevertheless those hundred or thousand plants are not infected. All that has been hitherto said is strictly correct, and if we limit our view to this, we shall see in the phenomena which have been described a conspicuous case of individual difference in predisposition : a case too perhaps, if we judge hastily, of sickly predisposition in the plants attacked, for they do become sick and the others do not. And yet this is not the true account of the matter. Every healthy cressplant is equally liable to the attacks of the Cystopus and to the rust-disease which it causes, only the liability is confined to a certain stage of the development, and ceases once for all when that stage is past. The germinating cress-plant in effect, first unfolds two small three-lobed leaves, the seed-leaves or cotyledons. When it has grown a little further and formed more foliage -leaves, the cotyledons wither and drop off. It appears then, that the germ-tubes of the fungus of white rust find their way into all the cotyledons and are able to develope there, and if this development has once begun, the fungus establishes

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27 itself at once in the tissue into which it has penetrated, and grows on in and with the growing plant, and produces the disease. The germ-tubes of Cystopus may indeed make their way for a short distance into all the other parts of the plant, but are unable to establish themselves inside it and continue their development. The plant is for the future safe from the attacks of the parasite as soon as the cotyledons have fallen off. The two or the twenty rusted plants in the bed are the ones in which the fungus attacked the cotyledons in good time; if it had attacked the thousand others in equally good time, all would have been rusted. They continued healthy, because they were not infected in the stage in which they were open to infection, that is, predisposed."

We may take another example from the human subject. Ringworm of the scalp due to the fungus Tricophyton tonsurans is not infrequently seen in children under 16 years of age, but after that age, though the fungus may affect other parts of the body, the scalp is generally free from it. Some change has taken place in the tissue there, which makes it less suitable for the growth of the parasite.

Now may not the function of the glands to which I have just now alluded, viz. that of destroying or neutralising effete or toxic products formed in the system, have some bearing upon the development of tuberculosis.] Thirty years ago it was suggested by Buhl that in the human subject acute miliary tuberculosis was due to the absorption into the blood of caseous matters from various sources. "It afterwards became the fashion to regard tubercle as always a secondary product the origin of which was sought for in 'caseous foci' of which the formation was supposed to precede, in all cases, the development of tuberculous lesions. . . The acute

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28 tuberculosis of children was traced back in a large number of instances to a simple intestinal or bronchial catarrh; this was supposed to lead first to swelling of the corresponding abdominal or thoracic lymph glands, and then to their caseation; and when once caseation had commenced the conditions for the development of tubercle were assumed to be present."

But, says Dr Hilton Fagge, whom I have just quoted, "Nothing is more certain than that in man, the inspissated pus of a common abscess, or the caseous matter of an atheromatous artery, or of a degenerating new growth or gumma, does not produce tuberculosis." We may neglect then the consideration of these caseous glands as "caseous foci" and yet their existence antecedent to or associated with tuberculosis is so general, that to the mind of the practical physician it would seem as if there must be some distinct relationship, as to cause and effect, between them.

May I venture to offer an interpretation of the fact?

Suppose that in an individual we have such a condition of the glands either inherited or acquired, such a "vulnerability" so to speak, that from more or less slight irritation of the mucous membrane of the throat, of the lungs, or of the intestines, the glands in connection with those parts become enlarged and inflamed and, instead of recovering, become caseous, these organs then would no longer be able to perform their function, whatever that function may be; and if it be that of modifying or destroying the effete material coming to them as the result of normal changes in the mucous membrane, this effete material must pass on into the circulation generally, and produce its noxious effects—lessen, it may be, the vitality of the white blood-corpuscles, or the epithelial or endothelial cells, or so modify the condition of the blood, that the tubercle bacillus finds a suitable soil in which to

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29 develope and flourish. Or it may be that these poisonous substances act specially as irritants of epithelial structure, causing an overgrowth of epithelial cells, just as we know will be the result when any other irritant is applied to these tissues; and so the soil is prepared for the lodgment of the bacillus. The human body in the normal state of things may be able to destroy the bacillus tuberculosis, just as the white corpuscles of the frog in Metschnikoff's experiment could destroy the bacillus anthracis, but not when placed in abnormal conditions.

In connection with this view of the matter, it is significant to find in the case of animals inoculated with tubercle that the lymph glands in the neighbourhood of the inoculation become enlarged and caseous, and this precedes general tuberculosis by a longer or a shorter time.

Nor would I maintain that the loss of function caused by the swelling and caseation of the various glands was the only way in which the tissue soil could be prepared for the reception of the bacilli. If, as I urge, tissue in a state of decay is suitable, so then I would suggest that imperfectly formed tissue would furnish equally suitable food for these parasites. Such tissue as would result from living in a close atmosphere with poor and insufficient food and insufficient exercise.

We could not imagine any conditions better calculated than these I have just mentioned to lower the activity or vitality of the epithelial cells of the pulmonary alveoli, or to interfere with the perfect organisation of the tissues generally, or to conduce more effectively to the accumulation of waste or effete material in the circulation, or to impede generally the action of the glandular structures, whereby these waste products should be rendered innocuous ; and no wonder that under these conditions the

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30 tubercle bacillus finds a congenial home in which it spreads and thrives and multiplies.

Again, the condition often seen in some parts antecedent to the formation of tubercles in the human system indicates that there is often some structural change before the bacilli take possession of the part, and "that their appearance on the scene is subsequent to the damage of which they are in fact the pathological consequences." Not infrequently, in cases of acute tuberculosis of other organs we find an affection of the membranes of the brain presenting all the characters of simple inflammation, no tubercles being discoverable. And iu the lungs the first stage of the morbid process is of a similar character, namely the filling of the alveoli with epithelial cells, or in other words a "catarrhal pneumonia." And according to the vitality of these epithelial cells will be the changes produced in them by the bacilli. Some of the cells possessing greater vitality will, when attacked by the bacilli, go on increasing or coalescing, and so, in some way or other, the formation of the so-called ** giant cells " takes place, which at one time were regarded as the typical elements of tubercle, and the remarkable phagocyte property of which has been recently shown by Metschnikoff to be something more than a theory. If the cells are of a weaker nature they quickly die and undergo degeneration, and become caseous.

And, once again, it may be suggested that when the bacilli have gained a footing in this effete or enfeebled tissue, whilst absorbing from it the constituents of their own protoplasm, they may give rise to, or secrete, poisonous products or ferments, capable of still further destroying or weakening the surrounding tissue or cellular elements and so obtain fresh food on which they can thrive. In this way, to use Dr Sanderson's words :

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31 "germs are not so much 'mischief makers' as mischief spreaders, that is to say that although an inflammation may come into existence without their aid, their presence communicates to it after it has come into existence the power of reproducing itself in previously healthy tissues whether by extension or dissemination."

Sometimes, however, even though the tubercle bacilli establish themselves in the tissue the epithelial cells may become strong enough to resist their further invasion and destroy them. The bacilli disappear and a "fibrous tubercle" containing giant cells but no bacilli is left behind as evidence of the fight which has taken place.

And does not this fact furnish us with our most important lesson? viz. that in the prevention and treatment of consumptive mischief our aim must be not so much to fight against the bacillus as to strengthen the parts attacked. To improve, that is, the condition of the blood and of the cellular elements by suitable dietetic, hygienic and medicinal means. And is not this in accordance with sound practical experience? That the tubercle bacillus will communicate the disease under ordinary circumstances to healthy individuals cannot for one moment be admitted. The statistics compiled by Drs Cotton and Theodore "Williams and Mr Edwards from the records of the Brompton Hospital relating to several hundreds of individuals, subjected more or less to contact and association with consumptive patients for three months and upwards, directly negative any idea of consumption being, in the ordinary sense of the word, an infectious disease. And therefore if a healthy human system can resist the invasion of the bacillus, surely the common sense view of preventing its invasion, or arresting its ,progress, must be to adopt such measures as will tend to the development of healthy tissue. That the internal administration

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32 of cod-liver oil is of great service generally in the treatment of Phthisis few I think will deny, and the same may be said of the free use of butter as an article of diet; the latter sometimes even appears to answer better than the cod oil, and is certainly more willingly taken. But what possible effect can oil and butter have on bacilli? Indeed I fear that the discovery of the tubercle bacillus has not proved in some respects to be an unmixed benefit, and that the result of treating patients in various ways by antiseptic remedies, has been that the patient, and not the bacillus, has succumbed.

Lastly, there is one important point to refer to in connection with these micro-organisms. We are surrounded on all sides with certain forms of them which under ordinary circumstances produce no injurious effects on the human frame, living only as saprophytes on dead animal or vegetable matter. Can these harmless organisms under any mode of cultivation acquire virulent or poisonous properties enabling them to attack living animal matter? Can the common bacillus of hay infusion, the bacillus subtilis be transformed into the bacillus anthracis? Or putting the question more generally can a specific disease arise de novo? Pathologists and bacteriologists differ strongly on this point. Buchner says that the transmutation of the hay bacillus into the bacillus anthracis does take place. Koch and Klein say it is impossible. All admit that the bacillus anthracis, if cultivated outside the human body, artificially, at a certain temperature, can have its properties so modified that it ceases to be poisonous, and after six weeks' attenuation can be injected into the blood of a living animal without producing any injurious effects : rabbits resist the injurious effects at an early stage of attenuation, guinea-pigs at a later stage, while it is only after the parasite has been cultivated

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33 for a period somewhat less than six weeks that mice seem to be impervious to its attacks. But how it is that this attenuation takes place—whether it is due to the effect of heat alone or to the effect of oxygen—bacteriologists are by no means agreed. Further it has been shown that when the attenuation of the bacillus has been brought about in a certain way (by the addition for instance of carbolic acid or potassium bichromate to the cultivation) its virulence is not regained when cultivated in fresh material at the ordinary temperature. But, attenuated in a different fashion, it does regain its virulence under those conditions. Again the virulence of a parasitic organism is materially altered according to the animal through which it has been transmitted. "In the course of Pasteur's interesting researches on swine plague he found that pigeons inoculated with the virus of swine plague died in six or eight days after suffering in the first instance from symptoms like those of fowl cholera. If the disease is transmitted from pigeon to pigeon, the organism after a time acts more violently, and the animal dies sooner. If, now, pigs are inoculated from these pigeons, death occurs more quickly than when inoculated from a pig, the organism having become more virulent. With the rabbit the converse is the case. The virus kills rabbits, but if it is passed through a series of rabbits it is no longer able to kill pigs" (Watson Cheyne).

Now, if this is the case, if the virulence of parasitic or pathogenic organisms can be thus modified, it seems incredible that organisms of similar structure, though apparently harmless saprophytes, cannot be cultivated in some way or other so as to become pathogenic. And when the bacteriologists tell us that it is impossible, that only means, I suppose, that they have not yet discovered the way. Specific diseases and pathogenic bacteria

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34 can hardly have existed from the foundation of the world; they must each have had their period of development, and what has developed through one period of time, may be developed again under similar circumstances. This may require a combination of circumstances acting simultaneously. Each circumstance separately may be in frequent action, but the necessary combination may present itself very rarely. A certain temperature and a special pabulum—a product perhaps of a certain stage of putrefaction—may be the first requisites to develope the pathogenic power of the bacterium; it may then require a special condition of the living animal organism, a lowered vitality, or an enfeebled state of health—the result perhaps or the same conditions of air, soil and temperature &c. which have called forth the power of the parasite—before it can find an entrance; and possibly after that its transmission through different species of animals may be necessary before it acquires destructive virulence, and is able, like the bacillus anthracis, to attack sound and healthy tissue. Instances are not rare of vegetable cells possessing poisonous properties at one time and not at another. Nageli has called attention to one of the most striking which is thus described by de Bary:—"The bitter almond tree is poisonous from the amount of amygdalin it contains, though it is not very dangerous to human beings; the sweet almond contains no amygdalin and is not poisonous. The sweet almond tree does not differ specifically from the bitter; a tree with bitter seeds may be produced from a sweet seed; bitter and sweet seeds may even be borne on the same tree in flowers and fruits not morphologically distinguishable from each other." What the origin or cause of this difference is, has not yet been discovered, and no explanation can as yet be offered;

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35 but the fact will help us to understand that cells may be developed by these micro-organisms capable of producing very diverse effects upon the system; and I incline therefore to the view that, probably from the simple neglect of ordinary sanitary measures, innocuous micro-organisms may become virulent and that diseases may arise de novo.

I have however detained you already too long with these speculations, and will not proceed further with them, tempting and important though the subject may be. One thing is clear and certain; there is very distinct evidence showing a relation between bacteria and certain diseases both in man and animals; but what the exact modus operandi is in the production of the disease can only be learned from further investigation, and additional study may throw a very different light on the relationship of these organisms to the respective maladies from that in which it may now be regarded. Whether this will be so or not, it seems to me, that with increasing knowledge of the chemical changes in the blood and in the tissues, we are on the threshold of most important discoveries, and of a very marked advance in the science of medicine. That physiologists are recognising in a greater degree than formerly the importance—nay, the absolute necessity—of further acquaintance with chemical physiology, is shown in a marked way, by the appearance of such works as those of Gamgee and Charles, and especially that most recent and most valuable one of McKendrick. Perhaps by further investigations into the chemical changes produced by bacilli, the constitution of the proteid molecule, complex as its nature is now regarded, may be unravelled and its properties better understood; we may be able to discover, possibly, what poison it is which the bacillus secretes, or how it is formed, or

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36 from what constituent of the proteid molecule it is derived. The other constituents of the molecule may perhaps furnish the antidote, or a poison antagonistic to that produced by the bacillus; for we know that poisons are antagonistic to each other—atropin and muscarin for example, We may even hope to find that the action and growth of the bacilli may be inhibited by certain substances, and then by injecting these substances into the blood, disease may be prevented, or if disease exists it may be arrested or cured. Is there not then, in this direction, much that should attract you and in Harvey's words "encourage you to search out the secrets of nature"? The changes seem so minute and inscrutable, sometimes so transitory, that amidst difficulties and disappointments we may often be discouraged and inclined to abandon the investigations. So it was with Harvey—"I found the task so truly arduous, so full of difficulties, that I was almost tempted to think with Fracastorius, that the motion of the heart was only to be comprehended by God At length by using greater and daily diligence I thought that I had attained the truth and that I had discovered what I so much desired, both the motion and the use of the heart and arteries." Reverently, earnestly and hopefully he continued his work, and he succeeded. Let us follow in his footsteps, gathering up the facts, and with minds educated and trained to reason upon the facts, let us try to penetrate further into nature's mysteries; thus may we be enabled to do God's work in the world, preventing and healing all manner of diseases, and so promote the happiness and welfare of mankind. One, whose memory is reverenced by all here, Dr Parkes, wrote : "In the scheme of Providence it may not be meant that man shall be healthy. Diseases of mind and body may be the cross he has to bear; or it may be the evil against which he has to struggle,

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37 and whose shackles he has finally to unloose. The last disease will disappear, we may believe, only when man is perfect; and as in the presence of the Saviour all disease was healed, so, before perfect virtue, sorrow and suffering shall fade away. Whether the world is ever to see such a consummation no man can say; but as ages roll on, hope does in some measure grow. In the midst of all our weaknesses, and all our many errors, we are certainly gaining knowledge, and that knowledge tells us, in no doubtful terms, that the fate of man is in his own hands." Let us hopefully strive to increase that knowledge and so help, each one, to hasten on the time, far distant though it yet appears, when the last disease will disappear and man be perfect; when "there shall be no more death, neither sorrow, nor crying, neither shall there be any more pain : for the former things are passed away."

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 By the same Author.

THE CKOONIAN LECTURES FOR 1886. Price 3s. Qd.

ON SOME POINTS IN THE PATHOLOGY OF

RHEUMATISM, GOUT, AND DIABETES; the Croonian Lectures for 1886, delivered at the Royal College of Physicians, London.

" Nothing could be clearer or more precise than Dr Latham's exposition of the difficult problems with which he essays to grapple Further research will demonstrate how far the author's views are scientifically sound; but in any case his work is a most praiseworthy and valuable contribution to modern medicine, and ought to be read and pondered by every physician who is interested in the elucidation of the vast problems of which it treats." — Saturday Rcvieiu.

" We believe their perusal will repay every thoughtful practitioner of medicine, for Dr Latham has, we think, succeeded in the endeavour to indicate some of the changes in the nervous system, the blood, and the tissues which may take place in diabetes, rheumatism, and gout. He has, further, brought together a number of facts, as he says himself, and drawn certain inferences from them, which, whether right or wrong, will certainly help to a better understanding of the diseases in question." — British Medical Journal.

" The arguments in support of Dr Latham's views afforded by appropriate treatment of rheumatism, gout, and diabetes by salicylic and benzoic acids and colchicum are not the least interesting part of the Croonian Lectures." — The Lancet.

"Dr Latham has made a valuable addition to the literature of the diseases which he discusses. Whatever may be the opinion as to his theory, there can be no two opinions as to the skill and ability with which he has collected and stated his facts and drawn his conclusions." — Scotsman.

" These lectures will serve a most important purpose by bringing to a focus, as it were, not only the author's own investigations, but the work of his contemporaries, and by causing interest in a field of investigation which is only now opening up to workers at physiological chemistry." — Edinburgh Medical Journal.

CAMBEIDGE : DEIGHTON, BELL, & CO. LONDON: GEOBGE BELL & SONS.

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 their mental work? There may be some insignificant exceptions to the rule that mental excellence and the qualities requisite to the ownership of capital do not unite in the same person; but the rule is thereby only confirmed. For whenever a great and useful invention or discovery or improvement in industry has been thought out, it can—if the community does not furnish the means for its realization—be carried out only by an investment of capital, and private capitalists must be called in to aid. But they would be slow to embark in an outlay of capital for hazardous purposes. They want the lion's share in the profits, if they can be convinced that the new scheme promises well; their incredulity prevents many a useful new scheme from being carried out; their greed appropriates many an invention into the secrets of which they had to be initiated, and robs the inventor of either his honor or reward, or of both. Among our greatest American inventors Eli Whitney, Robert Fulton, the Brothers Goodyear, McCormick, Morse, and the unknown inventor of the sewing-machine, died poor. Thousands of others of minor rank in merit have died poor, broken-hearted, insane, and almost all the well-paying patents have not inured to the benefit of the really deserving men. Among our greatest discoverers and scientists a long list might be given of such as have not derived any great reward or even any reward at all for their meritorious work. hey were compensated by the thought that they had benefited mankind, and had discharged in this way a debt of gratitude which they owed to all previous thinkers and workers. For, what would even the most eminent inventor or discoverer be, if there had not a long series of thinkers and workers preceded him, each of whom advanced by a little the store of wisdom, knowledge, and power of mankind? Already in the earliest, darkest ages were invented the arts of weaving and spinning, of tanning hides and melting ores, of striking fire and cooking, of taming domestic animals and improving plants, of navigating and wagoning, and many more, of whose inventors no name has come down to us, so that all mankind must be taken as the creator of all of these. And last, but not least, the origin and very gradual improvement of spoken, and later, of written language, this most important means of progress, is it not the common work of all men that ever lived? Is it, therefore, not a sacred truth that all the means of progress and wealth are a common inheritance of mankind, because they are produced by its common work and gradual self-development? Is it not a thievish undertaking to fence in, as it were, Sciences, Arts, Knowledge and Skill, and their fruits, for the exclusive appropriation of a minority of men,


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 instead of preparing and inviting all to enjoy them? Is it not enough that unjust laws give a few the power which lies in private riches, for political rule; must also the great and only redeeming and liberating power which exists in the human treasure of knowledge and_ skill, be made a tool for the rich to wield it for the debasement and subjection of the working classes? Is it not the worst kind of robbery to measure out a better kind of education to the upper-ten thousand, a worse one to the millions of workers? to enable by patent laws the capitalists to swallow up almost all the benefits accruing from inventions and discoveries, instead of rewarding the inventors and discoverers, and at once publishing their new schemes? to force, by a network of legal circumstances, the Scientists and artists into the service of private capital, instead of employing them for the furtherance of universal Co-operation among workers?

And not even in minor matters does our legislation protect labor from the robbery of capital. There is no lien law for unpaid wages, no law against the truck-system, no law against contract labor in our prisons; no law forbidding unsafe scaffolding in building operations; no law for the industrial education of apprentices; no law providing for the sanitary inspection and regulation of factories, mines, and conveyances (except in one or two places) and of workingmen's dwellings, etc., etc.

This is the gratitude of Capital toward its producers and protectors! Already, the first of all Political Economists, has confessed to us the truth that labor is the only source of all wealth, that capital will never produce anything without labor, and that it could not for a moment continue to exist without the protection which the great body of workers give it by their voluntary respect for the laws. No standing army and no police force, however numerous, could ever repress a majority of laborers who are smarting under the sufferings and indignities inflicted on them by capital, and prevent them from forcibly destroying its privileges or abuses, and from helping themselves to what they need. If those privileges and abuses are respected for the time being and attacked only in a lawful way, it is but the good sense and the wonderful patience of the workers which is the cause of the security and, therefore, of the high value of private property. It is not so very long ago that the Barn-burners in the state of New York destroyed by force the great feudal properties and privileges which had, by the English government, been conferred upon a few wealthy monopolists; and their deeds of violence were justified by great lawyers, and finally sanctioned by law. The revolutionary heroes of American history broke a great many of


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 The first appearance of Dr ’s book was not, indeed, hailed with the universal approbation of men of professional distinction. Many, if not all, of the objections which were urged against his practice arose from a complete misapprehension of the principles on which it was founded, and a neglect of the cautions which the author had uniformly observed, and which he anxiously recommended to others. Without referring to the writers whose animadversions never provoked Dr to engage in any controversy, we may take notice of the remarks of Sir , introduced into his work entitled Elements of Medical Logic, in which work Dr ’s practice is controverted, particularly with respect to the exhibition of purgatives in the cure of Typhus, Scarlatina, and Chorea Sancti Viti. Dr on this occasion, though he adhered to his previous resolution to restrain from publishing any defence, thought it prudent to print for private circulation among his friends a few copies of a Letter to Professor , containing remarks on some passages in Sir ’s book.

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 the laws imposed by England, and destroyed many vested rights and properties, and their names have come down to us revered and immortal. Every revolution destroys some vested and property rights, and the only difference there is between a revolution which is forever extolled and a riot against capital which is condemned is, that the former is successful, because upheld by a majority, and the latter is not.

We come to the last argument which proves that capital is legalized robbery. There could no capital whatever exist, if there did not exist private property in land. And for three reasons: 1. The laws which sanction private property in land, cause sooner or later a majority of citizens to be poor, and dependent for their livelihood on the owners of he means of labor. The greater the number of the landless, and the more dependent their condition, the greater is also their competition for employment; and the more the rate of wages is lowered, the greater is the rate of employers' profits—which are the origin of capital. In this downward tendency of wages the capitalists who are engaged in the same kind of production lend a helping hand. They compete among themselves to secure the best market for their merchandise, and the more so, the more there are countries with Capitalistic Production and varied industry, whose producers compete for the world's market. In this competition the greater capitals which can apply all the most modern improvements of production on a large scale, have advantages over the smaller. The greater the profits, the greater can be the accumulation of capital. The smaller the rate of wages, the greater can be the profits. Thus it is a double competition, that of the capitalists of all the world, and that of the laborers of all the world, which grinds, as between millstones, the laborers to dust, and reduces the large number of small capitalists to a small number of large capitalists, or real monopolists. 2. When private property in land is sanctioned, money becomes a far more valuable property than before, because it now can buy land. When land can lawfully be bought, sold, mortgaged, and encumbered, it is the best of all securities for money, and these two kinds of merchandise enhance each other in price, while that of labor sinks. When money can be exchanged for real estate, it can no longer be stolen, lost, burned, or annihilated, and for this reason it grows more valuable. When land can be sold or mortgaged, it assumes all the privileges of money, it becomes a value easy to exchange, to transport (the title, of course) to speculate with it, and to bring greater returns by improvements with borrowed money. Besides, when land can be sold or mortgaged, a far greater amount of money is needed to carry


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 purgative medicines for any other purpose than to produce a laxative effect only, in the cases in which Sir deprecates most strongly a course of purging which Dr  had himself from the first disapproved, as having a tendency to exhaust the patient. He had invariably declared that in the cases of Typhus, Scarlatina, and Diarrhoea, important as it is to unload the bowels, it is equally important to guard against the risk of inducing weakness. In the case of Chorea, which Sir professed in ordinary cases to cure by the cold bath and metallic tonics, Dr  had in his work represented the utility of the application of cold to the surface to depend chiefly on the influence which cold possesses in promoting and supporting the alvine evacuation. With respect to metallic tonics, he had no confidence in them whatever.

On another point, namely, the specific action of Purgative Medicines, Sir decidedly differed from Dr ; and maintained, that no practical fact was better established, than that the various species of purgatives were distinguished in their operation by dislodging different species of corrupted secretions, and other feculent matter. Dr was not convinced that this point was satis-


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 on the exchanges of goods than before; money is more in demand, and will be loaned out on interest only. This is the reason why all the established religions forbid the taking of interest. The Hindu, Mosaic, Christian, and Mahometan religions were all founded at a time, or in countries when and where land could not be sold; money then was not capital, it was considered unfair to loan it on interest, or at a high rate of it. All lenders on interest were styled usurers, harpies, robbers of the needy. But when, at a later epoch, land became private property and was sold and mortgaged, Hindus, Jews, Christians, and Mahometans (and the clergy foremost) disregarded their religious teachings, and by allowing interest the laws created capital. 3. But this system of capitalism once inaugurated, every kind of speculation, however immoral was admitted, and could not without inconsistency, ever again be stopped by laws. The owner of some capital could now borrow on credit so as to double or treble his investments in merchandise and his profits accruing therefrom, while the disinherited laborer enjoyed little or no credit at all. A crafty speculator could now buy up lands, food, raiment, or any kind of wares needed by the poor, and sell them at great profits which allowed him to double his capital and his credit within a very short period. Small capitals could now be united into gigantic capitals with corresponding credit, and undertake monopolistic enterprises which bore unheard of rates of returns, all from the unpaid labor of the workers. Real estate now rose to prices and assumed (in the fancy of the people) values of an almost ridiculous amount. We will not waste our space with a description of the gambling operations practiced at the Bourse, in which—though every nine gamblers may loose their capital to one big swindler—the loss is always in the end borne by the working people, the only producers, payers of interest, and taxes. We will only analyze how it is that most real estate has a most unreal, a fictitious value, and thus becomes the basis of all capitalism.

It is but natural that fertile lands should be considered more useful than barren ones, a location near a sea harbor more valuable than one in a neighborhood which is remote from all communications, because in the former case human labor can produce more value, within a given time, than in the latter. But this natural difference in the valuation of lands will not be very great, never at the rate of a thousand-fold or more. On the contrary, we find it to be an invariable law (in capitalistic times) that the price of the land increases with the population, and in new countries nearly twice as quick as the population (in the United States, from the first census of