=============+=============+=============+=============+============== MAMMALS |CARNIVORA, OR|HERBIVORA, OR|OMNIVORA, OR | FRUGIVORA, OR COMPARED |FLESH-EATERS | HERB-EATERS | ALL-EATERS | FRUIT-EATERS -------------+-------------+-------------+-------------+-------------- Examples. |Cat, dog, |Cow, horse. |Hog, peccary.|Man, monkey. |lion. | | | -------------+-------------+-------------+-------------+-------------- Length of |3 times |30 times |10 times |12 times food tube. |length of |length of |length of |length of |body. |body. |body. |head-trunk. -------------+-------------+-------------+-------------+-------------- Teeth. |Pointed for |Layers of |Cutting teeth|Teeth even, |tearing |enamel and |project. |close |flesh. Canine|dentine |Canines form |together. |teeth long. |forming |tusks. |Canines not | |ridges. | |projecting. -------------+-------------+-------------+-------------+-------------- Digits. |Sharp claws. |Hoofs. |Hoofs. |Flattened | | | |nails. -------------+-------------+-------------+-------------+-------------- Colon. |Smooth. |Sacculated. |Smooth. |Sacculated. =============+=============+=============+=============+============== _Milk_ of cows is improperly called a perfect food by some writers. Although it contains the four classes of food stuffs, the proteid is in excess, the fuel food being deficient. Buttermilk is more digestible than sweet milk. Buttermilk and sugar form a valuable food for infants. Skimmed milk still contains the proteid, the most nutritious part of the milk. Sour milk, or “clabber,” and curds pressed into “cottage cheese” are more digestible than sweet milk. _Cream_ is more easily digested than _butter_, which is a solid fat. _Cheese_ is a very concentrated proteid food, and should be eaten sparingly. _Eggs_ are a valuable food. Is there more proteid or fat in eggs? (See Table.) Pork and veal are the most indigestible of meats. _Fish_ is nearly as nutritious as meat. There used to be a supposition that fish nourished the brain because it contains phosphates; but there are more phosphates in meat than in fish, and more in grains than in meat.