Athenaeus stated that Galen wrote more treatises than any other Greek, and although many are now lost, more particularly of his logical and philosophical writings, his collected extant works in Greek text and Latin translation fill some twenty volumes averaging a thousand pages each. When we add that often there are no chapter headings or other brief clues to the contents,[522] which must be ploughed through slowly and thoroughly, since some of the most valuable bits of information come in quite incidentally or by way of unlooked-for digression; that errors in the printed text, and the technical vocabulary with numerous words not found in most classical dictionaries increase the reader’s difficulties;[523] and that little if any of the text possesses any present medical value, while much of it is dreary enough reading even for one animated by historical interest, especially if one has no technical knowledge of medicine and surgery:—when we consider all these deterrents, we are not surprised that Galen is little known. “Few physicians or even scholars in the present day,” continues the English historian of medicine quoted above, “can claim to have read through this vast collection; I certainly least of all. I can only pretend to have touched the fringe, especially of the anatomical and physiological works.”[524] [Sidenote: The manuscript tradition of Galen’s works.] Although the works of Galen are so voluminous, they have reached us for the most part in comparatively late manuscripts,[525] and to some extent perhaps only in their medieval form. The extant manuscripts of the Greek text are mostly of the fifteenth century and represent the enthusiasm of humanists who hoped by reviving the study of Galen in the original to get something new and better out of him than the schoolmen had. In this expectation they seem to have been for the most part disappointed; the middle ages had already absorbed Galen too thoroughly. If it be true, as Dr. Payne contends,[526] that the chief original contributions to medical science of the Renaissance period were the work of men trained in Greek scholarship, this was because, when they failed to get any new ideas from the Greek texts, they turned to the more promising path of experimental research which both Galen and the middle ages had already advocated. The bulky medieval Latin translations[527] of Galen are older than most of the extant Greek texts; there are also versions in Arabic and Syriac.[528] For the last five books of the _Anatomical Exercises_ the only extant text is an Arabic manuscript not yet published.[529] [Sidenote: Galen’s vivid personality.]