The Natural History of Pliny, Volume 3 (of 6)

Chapter 81: CHAP. 78.—THE BELLY: ANIMALS WHICH HAVE NO BELLY. WHICH ARE THE ONLY ANIMALS THAT VOMIT.

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The work assembles systematic observations on animals, insects, and trees, combining natural history with practical notes. It surveys insect forms and habits, including bees, silk‑producing worms, spiders, and parasitic species, and discusses reproduction, classification, diseases, and useful products like honey and silk. It then examines animal anatomy in detail, limb by limb and organ by organ, comparing organs, vital functions, and bodily peculiarities across species. Later sections catalogue trees and exotic plants, describing aromatic gums, spices, frankincense, myrrh, and methods for producing and testing unguents and perfumes, and noting their uses and regions of origin.

CHAP. 78.—THE BELLY: ANIMALS WHICH HAVE NO BELLY. WHICH ARE THE ONLY ANIMALS THAT VOMIT.

In those animals which have a stomach, below the diaphragm the belly is situate. In other animals it is single, but in those which ruminate it is double; in those, again, which are destitute of blood, there is no belly, for the intestinal canal commences in some of them at the mouth, and returns to that part, as is the case with the sæpia and the polypus. In man it is connected with the extremity of the stomach, and the same with the dog. These are the only creatures that have the belly more narrow at the lower part; hence it is, too, that they are the only ones that vomit, for on the belly being filled, the narrowness at its extremity precludes the food from passing; a thing that cannot possibly be the case with the animals in which the belly is more capacious at the extremity, and so leaves a free passage for the food to the lower parts of the body.