Much uncertainty prevails respecting the generic classification of the bears. Wallace has divided them into five genera or subgenera, and fifteen species. Wood gives eighteen, and Gray says twelve. The appearance of the bear at different seasons has led to much error in classification. The practical mountaineer will tell you of some three or four species in California that have been given notice of as the young of another species, or that have never been mentioned by the learned gentlemen who usually study bear life in the seclusion of a library or with the help of a strong field telescope. A glance at the teeth of the bear will tell you that they incline rather to the vegetable diet. Their ferocity is almost always exaggerated. Their courage is desperate in self-defense, but it is seldom that they become the aggressor. The brain of the bear is very highly developed, and they soon learn all kinds of accomplishments. The lion is an uncouth boor in comparison.
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.