From the earliest times physicians and writers occupied themselves largely with obstetrics, as was most natural. The Hippocratic collection includes monographs on _Generation; the Nature of the Infant; the Seventh Month of Pregnancy; the Eighth Month of Pregnancy; on Accouchement; Superfoetation; on Dentition; on Diseases of Women; on Extraction of the Dead Foetus_. The treatise on superfcetation concerned itself mainly with obstetrics. On epidemics Hippocrates writes extensively, showing that he had studied them carefully. He was among the first to connect meteorological phenomena with those of disease during given seasons of the year, expressing the hope that by the study of storms it would be possible to foresee the advent of the latter, and prepare for them. Seven books of the Hippocratic collection bear the title of _Epidemics_, although only two of them are exclusively devoted to this subject. In these books were contained a long{024} list of clinical observations relating to various diseases. They constituted really a clinical study of disease. The collection of Hippocrates's _Aphorisms_ fills seven of the books; no medical work of antiquity can compare with these. Physicians and philosophers of many centuries have professed for them the same veneration as the Pythagoreans manifested for their golden verses. They were considered the crowning glory of the collection. Even within a short time past the Faculty of Paris required aspirants for the medical degree to insert a certain number of these in their theses, and only the political revolution of France served to cause a discontinuance of this custom. These aphorisms formed, says Littré, "a succession of propositions in juxtaposition, but not united." It has always been and always will be disadvantageous for a work to be written in that style, since such aphorisms lose all their general significance; and that which seems isolated in itself becomes more so when introduced into modern science, with which it has but little practical relationship. But not so if the mind conceive of the ideas which prevailed when these aphorisms were written; in this light, when they seem most disjoined they are most related to a common doctrine by which they are united, and in this view they no longer appear as detached sentences.