_The Carnivora._—The next great class that we must consider is the _carnivora_. Their teeth are very distinctive, and their shape and arrangement are entirely different from those of any of the other animals. There are the incisor teeth in front, and molars behind; but the most distinctive teeth are the canine, which especially distinguish this class of feeders. There are four of these—two in each jaw, placed upon the sides, and they are long, sharp, and pointed. The more nearly the animal is purely carnivorous, the more are these teeth developed, and the less meat the animal eats, the less are they developed. Thus, the feline species, which is perhaps the most typically carnivorous of all, have canine teeth very well developed; in them, they are most marked. In such animals, the canine teeth are also set considerably apart from other teeth. In the dog, however, the teeth are less prominent than they are in the cat; his claws, eyes, etc., are also less distinctly carnivorous, and it will be observed that his habits are decidedly less like those of the preying animal than are those of the cat: he sleeps at night instead of in the daytime; does not adopt the stealthy methods for catching birds, etc., which the cat follows. All this has its significance when it is remembered that dogs are much more easily weaned away from a flesh diet, on to one of milk, bread, biscuits, etc., than are cats, who are very difficult to wean from their carnivorous habits. This, however, is by the way. In the bear family, again, the carnivorous characteristics are still less marked. The canine teeth are less and the molars and incisors more developed—the latter having a flat but roughened crown. All this indicates a still nearer approach to a vegetable and fruit diet—as is actually the case. The bear, as is well known, is fond of berries, fruits of all kinds, milk and honey. * * * * *