The Polar Bear, _Thalassarctos Maritimus_, is the only representative of the genus. He is an almost wholly carnivorous animal, his food consisting of fishes and seals, which he skillfully captures. He can swim better than any other bear, and has been known to swim a strait forty miles wide. The fur is silver white tinged with yellow. This color is variable in specimens, and according to the seasons. The head is much smaller than that of the grizzly or black bear, and is ferret-like, with a decided downward curve to the nose. The nose does not possess the flexibility of that of the rest of the bear family, although the polar bear has the higher development of the sense of smell. Johnson says that the flesh is good to eat, but other writers do not agree with him. Kane was poisoned by eating of the liver. In speaking of a capture De Vere wrote as follows: "We dressed her liver and ate it, which in taste liked us well, but it made us all sick * * * for all their skins came off, from the foot to the head, but they recovered again, for which we gave God hearty thanks." Hall says that the Eskimos of Cumberland Sound likewise believe the liver to be poisonous, even for the dogs. Ross says all who partook of the meat suffered from severe headaches, and later the skin peeled from the body. Greely says his party largely lived upon the meat, and that it was coarse, tough, the fat having a decidedly rank flavor. I believe that the physiognomist may follow the characteristics of an animal by his facial expression, and that with the aid of a knowledge of the cranial development he can gauge the mental caliber of the beast. Following this system and adding to it the testimony of credible explorers, it is quickly shown that the polar bear is treacherous and intractable. While he is not the wise animal the grizzly is, he is more cunning and is certainly not a coward. There are times when he is not content with being let alone, but will take the aggressive. Greely writes: "Doctor Copeland was surprised only fifty yards from the ship by a bear which broke from a barrier of ice hummocks, galloped up to within five paces, reared up and struck him down with both forepaws. Copeland had no time to load his gun, but as the animal caught his clothes, he swung the butt across his snout. This and the noise of approaching comrades put the bear to flight, and he started off with the swinging gallop peculiar with him." The mother bear and cubs display a great fondness for one another. Koldeway says: "No sooner did the young ones perceive the hunter than they galloped toward their mother, who in two strides turned and stood by them, with such rage expressed in all her actions that we knew we must be careful. Finding, however, that they were unhurt, she seemed to think only of bringing them to a place of safety."