also well known that the Asclepiadæ noted down with great care the symptoms and issue of every case, and that, from such observations, they became in time great adepts in the art of prognosis. When we come to an analysis of the different Hippocratic treatises, it will be seen that there is strong reason to believe we are still possessed of two documents composed from the results of observations made in the ancient Temples of Health. It would also contribute much to the increase of medical knowledge in this way, that the office of priesthood was hereditary in certain families, so that information thus acquired would be transmitted from father to son, and go on accumulating from one generation to another.[12] Whether the Asclepiadæ availed themselves of the great opportunities which they must undoubtedly have had of cultivating human and comparative anatomy, has been much disputed in modern times; indeed, the contrary is expressly maintained by some eminent authorities, such as Gruner[13] and Sprengel.[14] But it will be shown in another place, that there is good reason for believing that these two scholars have greatly underrated the amount of anatomical knowledge possessed by Hippocrates, and his predecessors the priest-physicians in the Temples of Health. Moreover, it is worthy of remark, that Galen holds Hippocrates to have been a very successful cultivator of anatomy.[15] Galen further states, upon the authority of Plato,[16] that the Asclepiadæ paid no attention to dietetics; but this opinion would require to be received with considerable modification, for, most assuredly, whoever reflects on the great amount of valuable information on this subject which is contained in the Hippocratic treatises, will not readily bring himself to believe that it could have been all collected by one man, or in the course of one generation. It is worthy of remark, moreover, that Strabo, whose authority I need scarcely say stands deservedly high in all literary matters, does not hesitate to affirm that Hippocrates was trained in the knowledge of dietetics, from documents preserved in the Asclepion of Cos.[17] That gymnastics, as stated by Galen,[18] wire not recognized as a regular branch of the healing art, until the age of Hippocrates, is indeed not improbable, and this perhaps is what Plato meant when he says that the Asclepiadæ did not make any use of the pedagogic art until it was introduced by Herodicus. But at the same time there can be no doubt, as further stated by Galen,[19] that exercise, and especially riding on horseback, constituted _one_ of the measures used by the Asclepiadæ for the recovery of health, having been introduced by Æsculapius himself.