breathe, and also to spear and capture fish, on which the Narwal lives. This horn produces beautiful ivory. 8. The CARNIVORA, or Flesh-eaters (fig. 67), include the Feline tribe, as the Lion, Tiger, Jaguar (fig. 68), Leopard, &c.; the Canine, as the Hyena, Wolf, Jackal, Dog, Fox, &c., the Ursine, which includes the Bears, and the Phocine, including the Seal kind. The Feline tribe are formed to spring upon, hold, and rend other animals which they kill for food, and have teeth and claws suitable to this purpose, and great activity and strength to enable them to contend with, and overcome their prey. They are, for the most part, nocturnal in their habits, seldom seeking their prey but in the night, and then mostly frequenting the drinking-places where other animals come for water. They attack by gradually stalking after the animal, getting nearer and nearer, till at last a well-directed spring brings them on to it at once. That these animals may better surprise their prey, they have eyes so extremely sensitive to light that they can see well when it would appear to Man to be quite dark, hence the saying, "cats can see in the dark." The Iris (or coloured part of the eyes) in this tribe is made so as to close up into a slit (1, fig. 66), and thus exclude the light of the day to a great extent, which would otherwise be too powerful, and injure the extreme sensibility of their vision. Their claws (2, fig. 66) are made to retract by a tendon, so as to keep their points from being worn by walking. This accounts for the silent, stealthy tread of the domestic cat; it enables them to creep quietly upon their prey, and at the moment they are about to seize them, the claws are extended. The pointed or flesh-teeth of the Carnivora are greatly developed, and are very sharp. Their molars (3, fig. 66) are pointed, and suitable to the food they are intended to masticate. The tongue of the feline tribe is very rough, and is used to rasp off the flesh from bones. When closely examined, the surface of their tongues present a series of horny hooks, all bending in one direction, and forming a sort of rasp. [Illustration: FIG. 66.--1, EYE OF LION. 2, CLAW. 3, TEETH.] The Lion is usually placed at the head of this race, but it is questionable whether he is so powerful as the Bengal Tiger, and combats between the two, generally give the mastery to the Tiger. [Illustration: FIG. 67.--CARNIVORA. 1, Lion (Leo Barberus); 2, Tiger (Tigris regalis).]