The Polar or Esquimaux race has been least known of all, and prior to the explorations of that true hero and true son of science, the late Dr. Kane, was scarcely known except in name. It is both Asiatic and American, but which continent is its birth-place is matter of doubt. The facilities for passing from one continent to the other were doubtless much greater at some former period than at present, and not only men but animals may have done so with ease. Except a few well-known species of animals and vegetables, which are essential to the well-being of the Caucasian, and which have accompanied him in all his migrations, each species has its own centre of existence, beyond or outside of which it is limited to a determinate existence. The Arctic animals are quite numerous, and differ widely from all others, but they are absolutely the same in Asia as in America, and therefore must have passed from one to the other, and man, however subordinate or inferior to other races endowed by nature with ample powers of locomotion and migration, could meet with only trifling obstacles in passing from one continent to the other. This race, though thus far of little or no importance, is doubtless superior to the Negro, for the necessities of its existence, the terrible struggle for very life in those bleak and desolate regions, infer the possession of powers superior to those of a race whose centre of life is in the fertile and luxuriant tropics, where nature produces spontaneously, and where the idle and sensual Negro only needs to gather these products to exist and multiply his kind.