Recent ignorance of Galen—His voluminous works—The manuscript tradition of his works—His vivid personality—Birth and parentage—Education in philosophy and medicine—First visit to Rome—Relations with the emperors; later life—His unfavorable picture of the learned world—Corruption of the medical profession—Lack of real search for truth—Poor doctors and medical students—Medical discovery in his time—The drug trade—The imperial stores—Galen’s private supply of drugs—Mediterranean commerce—Frauds of dealers in wild beasts—Galen’s ideal of anonymity—The ancient book trade—Falsification and mistakes in manuscripts—Galen as a historical source—Ancient slavery—Social life; food and wine—Allusions to Judaism and Christianity—Galen’s monotheism—Christian readers of Galen. II. _His Medicine and Experimental Science_ Four elements and four qualities—His criticism of atomism—Application of the theory of four qualities in medicine—His therapeutics obsolete—Some of his medical notions—Two of his cases—His power of rapid observation and inference—His happy guesses—Tendency toward scientific measurement—Psychological tests with the pulse—Galen’s anatomy and physiology—Experiments in dissection—Did he ever dissect human bodies?—Dissection of animals—Surgical operations—Galen’s argument from design—Queries concerning the soul—No supernatural force in medicine—Galen’s experimental instinct—His attitude toward authorities—Adverse criticism of past writers—His estimate of Dioscorides—Galen’s dogmatism; logic and experience—His account of the Empirics—How the Empirics might have criticized Galen—Galen’s standard of reason and experience—Simples knowable only through experience—Experience and food science—Experience and compounds—Suggestions of experimental method—Difficulty of medical experiment—Empirical remedies—Galen’s influence upon medieval experiment—His more general medieval influence. III. _His Attitude Toward Magic_ Accusations of magic against Galen—His charges of magic against others—Charms and wonder-workers—Animal substances inadmissible in medicine—Nastiness of ancient medicine—Parts of animals—Some scepticism—Doctrine of occult virtue—Virtue of the flesh of vipers—Theriac—Magical compounds—Amulets—Incantations and characters—Belief in magic dies hard—_On Easily Procurable Remedies_—Specimens of its superstitious contents—External signs of the temperaments of internal organs—Marvelous statements repeated by Maimonides—Dreams—Absence of astrology in most of Galen’s medicine—_The Prognostication of Disease by Astrology_—Critical days—_On the History of Philosophy_—Divination and demons—Celestial bodies. ἀλλ’ εἴ τις καταγνῷ μου τόδε, ὁμολογῶ τὸ πάθος τοὐμὸν ὃ παρ’ ὅλον ἐμαυτοῦ τὸν βίον ἔπαθον, οὐδενὶ πιστεύσας τῶν διηγουμένων τὰ τοιαῦτα, πρὶν πειραθῆναι καὶ αὐτὸς ὧν δυνατὸν ἦν εἰς πεῖραν ἐλθεῖν με. Kühn, IV, 513.