Acknowledgements; Note on translations; Note on abbreviations; Introduction; Part I. Hippocratic Corpus and Diocles of Carystus: 1. The 'theology' of the Hippocratic treatise On the Sacred Disease; 2. Diocles and the Hippocratic writings on the method of dietetics and the limits of causal explanation; 3. To help, or to do no harm: principles and practices of therapeutics in the Hippocratic Corpus and in the work of Diocles of Carystus; 4. The heart, the brain, the blood and the pneuma: Hippocrates, Diocles and Aristotle on the location of cognitive processes; Part II. Aristotle and His School: 5. Aristotle on melancholy; 6. Theoretical and empirical elements in Aristotle's treatment of sleep, dreams and divination in sleep; 7. The matter of mind: Aristotle on the biology of 'psychic' processes and the bodily aspects of thinking; 8. Divine movement and human nature in Eudemian Ethics 8.2; 9. On sterility ('Hist. an. 10'), a medical work by Aristotle?; Part III. Late Antiquity: 10. Galen's use of the concept of 'qualified experience' in his dietetic and pharmacological works; 11. The Methodism of Caelius Aurelianus: some epistemological issues; Bibliography; Index of passages cited; General index.