in Natural History, is applied to an animal which chews over again what it has eaten before; which is popularly called chewing the cud. Peyer, in a treatise De Ruminantibus et Ruminatione, shows that there are some animals which really ruminate; as oxen, sheep, deer, goats, camels, hares, and squirrels: and that there are others which only appear to do so, as moles, crickets, bees, beetles, crabs, mullets, &c. The latter clas, he observes, have their stomachs composed of mucous fibres, by which the food is ground up and down as in those which really ruminate. Mr Ray observes, that ruminants are all four-footed, hairy, and viviparous; some with hollow and perpetual horns, others with deciduous ones.