On Animals, Books 13-26

Chap. 3. Concerning the natural cause of the making of the testicles in animals having testicles . . . . . . . . . § 13-18, p. 995-998

Chap. 4. Concerning the cause for which those things which do not have testicles are very rapid in coitus, and those things which have internal testicles are of more rapid coitus than those which have external testicles . . . . . § 19-23, p. 998-1000

Chap. 5. Concerning the natural cause and disposition of the wombs, and their differences in animals . . . . . . . . § 24-29, p. 1000-1003

Chap. 6. Why in all animals the wombs are inside the body, but in some the testicles are inside and in some outside . . . . . . . . § 30-34, p. 1003-1005

Chap. 7. Concerning the disposition and cause of the genital members in the four genera of animals: soft-shelled, malakye, jointed-bodied, and hard-shelled . . . . § 35-40, p. 1005-1008

Chap. 8. And it is a digression declaring the true understanding of all things that have been adduced concerning the causes of the genitals in the preceding chapters . . . . . . . . . . § 41-57, p. 1008-1015

Treat. II which is concerning the nature of the sperm . . . . . . . . . § 58-145, p. 1015-1057

Chap. 1. Concerning the questions that exist about sperm, and whether sperm is cut off from all members by the mode that Plato said . . . . . . . . . . . § 58-65, p. 1015-1018

Chap. 2. Whether sperm is cut off from the whole body as Empedocles and Anaxagoras said . . . . . . . . § 66-74, p. 1018-1022

Chap. 3. Concerning the refutation of the statement of Empedocles and Anaxagoras through the cause of masculinity and femininity and through the cause of generating things dissimilar to themselves in genus § 75-82, p. 1023-1026

Chap. 4. What kind of principle of generation is sperm when it is said that generation comes from sperm, and what it is according to nature . . . . . . . . . § 83-87, p. 1026-1028

Chap. 5. By what mode is sperm in the body of the one who produces it, and by what mode does it exit from him . . . . . . . . § 88-100, p. 1028-1035

Chap. 6. Concerning the nature of sperm and of the menses, both of the female and of the male, which it has according to what it is as a principle of generation . . . . . . . . . . . § 101-112, p. 1035-1040

Chap. 7. Concerning the cause of the pleasure of coitus and concerning the quality of the humor that flows from the female through the genital parts § 113-121, p. 1040-1044

Chap. 8. Concerning the mode by which the sperm that exits from the male and the humor that flows out from the female behave toward each other . . . . . . . . . . . . . . . . . . . . § 122-127, p. 1045-1048

Chap. 9. Concerning the mode of the union of the sperm of the male and female in the generation of the conceptus . . . . . . . . . . . § 128-132, p. 1048-1051

Chap. 10. And it is a digression declaring those things that have been said concerning the sperm of the male and its virtues . . . . . . § 133-140, p. 1051-1054

Chap. 11. And it is a digression declaring the difference of the two sperms of the male and female, and of the menstrual blood which exits from the females of certain animals . . . . . . . . . . . . . . . . . . . . § 141-145, p. 1055-1057