The hom[oe]opathists would work a strange revolution in the Materia Medica.[13] Charcoal, Silica, and other substances commonly supposed to be inert, appear as remedies of wonderful efficacy. It is said that Belladonna produces a state like scarlatina, and also a condition resembling hydrophobia, and thus cures both of these disorders. Of these three propositions it is almost needless to say that all are equally erroneous. Further, an experimental trial of this principle was made by Andral on a large number of patients at the Académie in Paris, with the assistance of the hom[oe]opathists themselves. The medicines were carefully and fairly administered, but in no one instance were they successful. (_Medical Gazette_, vol. xv. p. 922.) _e._ The idea that diseases are to be cured by assisting nature to eliminate from the system the morbid material, is probably as old as medicine. It was one of the doctrines of Hippocrates; but long even before his time it appears to have been inculcated by a certain sect of old medical writers among the Hindoos. These last were the very earliest advocates of the humoral pathology. (_Dr. Wise_, _op. cit._ p. 212.) Dr. Thomas Sydenham, born in 1624, the contemporary of Harvey, and the most illustrious of the early English exponents of the humoral system, was probably the first in this country who clearly elaborated this view of the action of medicines by elimination; which has been more or less approved, though not so universally applied, by all who have lived since his time. Agreeing with Stahl in his view of the advantages of the "expectant" treatment of diseases, he thought it better to rely on the "vis medicatrix naturæ," than to make rash or violent attempts at a cure. He maintained that what we call a _disease_ was in fact "no more than a vigorous effort of nature to throw off the morbific matter, and thus recover the patient."[14] He proposed, therefore, that our efforts should be directed to assist nature to procure the evacuation of a poison, promoting its elimination by acting on the various secretions--as by purgatives, diaphoretics and such medicines. For he had noticed that in fevers and febrile disorders the crisis or turning-point was generally accompanied or preceded by an increase in one or more of these secretions, and he regarded this as an indication of the treatment to be pursued in all such cases. "That," said he, "appears to be the best method of curing acute diseases, which, after nature has pitched upon a certain kind of evacuation, assists her in promoting it, and so necessarily contributes to cure the distemper."[15] He further proposed, that in the treatment of chronic diseases, when nature herself was slow in procuring this evacuation, we should seek for _specific_ medicines, by which we might assist her in doing so, and thus effectually expel the morbific matter. This theory was reasonable and natural compared to those that followed it; but it was nearly