ways, but they were mere schoolboys to old Aristotle.' CHARLES SINGER. MEDICINE Ἡροφιλος δε εν τω Διαιτητικω και σοφιαν φησιν ανεπιδεικτον και τεχνην αδηλον και ισχυν αναγωνιστον και πλουτον αχρειον και λογον αδυνατον, ὑγιειας απουσης. {Hêrophilos de en tô Diaitêtikô kai sophian phêsin anepideikton kai technên adêlon kai ischyn anagôniston kai plouton achreion kai logon adynaton, hygieias apousês.} Herophilos, a Greek philosopher and physician (_c._ 300 B. C.), has truly written 'that Science and Art have equally nothing to show, that Strength is incapable of effort, Wealth useless, and Eloquence powerless if Health be wanting'.[55] All peoples therefore have had their methods of treating those departures from health that we call disease, and among peoples of higher culture such methods have been reduced in most cases to something resembling a system. In antiquity, as now, a variety of such systems were in vogue, and those nations who practised the art of writing from an early date have left considerable records of their medical methods and doctrines. We may thus form a fairly good idea of the medical principles of the Mesopotamian, the Egyptian, the Iranian, the Indian, and the Chinese civilizations. Much in these systems, as in the medical procedure of more primitive tribes, was based upon some theory of disease which fitted in with a larger theory of the nature of evil. Of these theories the commonest was and is the demonic, the view that regards deviation from the normal state of health as due either to the attacks of supernatural beings or to their actual entry into the body of the sufferer. A medical system based on such a view is susceptible of great elaboration in a higher civilization, but not being founded on observation is hardly capable of indefinite development, for a point must ultimately be reached at which the mind recoils from complex conclusions far remote from observed phenomena. The medicine of the ancient and settled civilization of such a people as the Assyro-Babylonians, for instance, of which substantial traces have been recovered, is hardly, if at all, more effective, though far more systematized, than that of many a wild and unlettered tribe that may be observed to-day. Of such medicine as this we may give an account, but we can hardly write a _history_. We cannot establish those elements of continuity and of development from which alone history can be constructed. [55] The works of Herophilus are lost. This fine passage has been preserved for us by Sextus Empiricus, a third-century physician, in his προς τοις μαθηματικους αιτιρρητικοι {pros tois mathêmatikous aitirrêtikoi}, which is in essence an attack on all positive philosophy. It is an entertaining fact that we should have to go to such a work for remains of the greatest anatomist of antiquity. The passage is in the section directed against ethical writers, xi. 50.