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| Book of Animals XIII in which is the cause and nature of the internal members | § 1-124, | p. 893-950 |
| Treatise I Concerning the windpipe, the esophagus, and the lung | § 1-75, | p. 893-927 |
| Chap. 1. Concerning the windpipe and esophagus and their natural causes | § 1-9, | p. 893-896 |
| Chap. 2. And it is a digression declaring the nature, cause, and mode of composition of the windpipe and lung | § 10-17, | p. 897-900 |
| Chap. 3. And it is a digression declaring the nature of the esophagus and stomach and their natural causes and positions | § 18-22, | p. 900-902 |
| Chap. 4. Concerning the disposition of the interiors in general and concerning the nature and cause of the heart | § 23-38, | p. 902-909 |
| Chap. 5. Concerning the cause of the origin of the veins from one principle which is the heart in animals, or that which is in the place of the heart | § 39-44, | p. 909-912 |
| Chap. 6. Concerning the cause of the lung and its accidents, and concerning the liver and spleen and their natural operations | § 45-54, | p. 912-916 |
| Chap. 7. And it is a digression declaring the understanding of those things which have been said concerning the liver and spleen | § 55-59, | p. 916-919 |
| Chap. 8. Concerning the nature and cause of the kidneys and bladder in animals in which there are kidneys and a bladder, and for what cause they are not in certain animals | § 60-68, | p. 919-923 |
| Chap. 9. Concerning the nature of the diaphragm and the nature of the other membranes which are in the body | § 69-75, | p. 923-927 |
| Treat. II Concerning the intestines | § 76-124, | p. 927-950 |
| Chap. 1. Concerning the disposition of the belly and the number of bellies and the diversity of the belly of animals | § 76-83, | p. 927-931 |
| Chap. 2. Concerning the modes of diversity of the intestines according to the diversities of the bellies | § 84-87, | p. 931-933 |
| Chap. 3. And it is a digression declaring the nature, order, and utility of the intestines | § 88-94, | p. 933-936 |
| Chap. 4. Concerning the internal members of creeping things and of those which are similar to them along the length of the body, in which there is also concerning the nature of the gall of such animals | § 95-101, | p. 936-939 |