Some may observe that the horse has but one stomach, and even that very small; that the ass, the hare, and other animals, which live on herbage, have also but one stomach, and, consequently, this explanation, though it seems probable, is not well grounded. But these exceptions, so far from controverting, appear to confirm this opinion, for although the horse has one stomach he has pouches in the intestines, so very capacious that they may be compared to the paunch of ruminant animals; and hares have a blind gut of so great a length and diameter, that it is at least equal to a second stomach; thus it is not astonishing that these animals can live on herbage alone. We find in general it is wholly on the size of the stomach and intestines that their manner of feeding depends; for ruminating quadrupeds, as the ox, sheep, goats, camels, &c. have four stomachs, and the intestines of a prodigious length; these live on herbage, and that alone suffices them. Horses, asses, hares, rabbits, guinea pigs, &c. have but one stomach, but they have a gut equivalent to a second, and live on herbs and corn. Wild boars, hedgehogs, &c. whose stomachs and bowels are less capacious, eat but little grass, and live on corn, fruits, and roots. Those, such as the wolf, fox, tyger, &c. which have the stomach smaller than other animals, in proportion to the size of their bodies, are obliged to chuse the most succulent aliments; and those which abound most with organic particles, and to eat flesh and blood, corn, and fruits. It is on this necessary and physical relation, then, much more than on the varieties of taste, that is founded the diversity which we see in the appetites of animals, for if necessity did not determine them oftener than taste how could they devour corrupted flesh with as much avidity as that which is fresh and juicy? Why do they eat equally of all kinds of flesh? We see that domestic dogs, which have it in their power to chuse, constantly reject certain meats, such as the woodcock, thrush, pork, &c. whilst wild dogs, wolves, foxes, &c. eat equally the flesh of the hog, woodcock, birds of all species, and even frogs, of which I once found two in the stomach of a wolf. When they can neither get flesh nor fish, they will eat fruit, corn, grapes, &c. but they always prefer that food, which, in a small portion, contains a large quantity of nutritive or organic particles, proper for the nourishment and subsistence of the body.