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I. The Life of Galen. II. Galen’s merits in medical science in general. III. The state of medicine in those times when Galen was changing its entire science. IV. What Galen discovered or stated more correctly in individual disciplines of medical science. V. Galen’s medical system. VI. The books written by Galen: Their nature. VII. Classes and the order of Galen's books. VIII. The plan followed by me in the order of Galen's books. IX. A review of individual books by Galen, specifically the genuine ones. 1. On sects for beginners. 2. On the best sect, addressed to Thrasybulus. 3. On the best teaching. 4. On sophisms or fallacies in speech. 5. That the best physician is also a philosopher. 6. An exhortation to the arts. 7. On the constitution of the medical art, addressed to Patrophilus. 8. On the elements according to Hippocrates, two books. 9. On temperaments The "temperaments" refer to the four bodily humors and their balance: blood, phlegm, yellow bile, and black bile., three books. 10. On black bile. 11. On unequal intemperance. 12. On the best constitution of our body. 13. On a good habit of body. 14. On natural faculties, three books. 15. On the substance of natural faculties. 16. On anatomical procedures, nine books. 17. On bones for beginners. 18. On the dissection of veins and arteries. 19. On the dissection of nerves. 20. On the dissection of muscles. 21. On the dissection of the uterus. 22. Whether blood is naturally contained in the arteries This was a major point of debate in antiquity; many believed arteries carried only air or "pneuma".. 23. On the motion of muscles, two books. 24. Dissection of the vocal organs. 25. On the causes of breathing. 26. On the doctrines of Hippocrates and Plato, nine books. 27. Fragment on Plato's Timaeus, or from the four commentaries titled: On those things which were spoken medically in Plato’s Timaeus. 28. On seed, two books. 29. On the use [of parts]