Mongolidæ as exercising upon the world a material rather than a moral influence; giving them meanwhile a color, neither a true white nor a jet black; hair straight and black, rarely light, sometimes curly; eyes sometimes oblique; a broad, flat face and a retreating forehead. Dr Prichard considers the American race, psychologically, as neither superior nor inferior to other primitive races of the world. Bory de St Vincent classifies Americans into five species, including the Eskimos. The Mexicans he considers as cognate with the Malays. Humboldt characterizes the nations of America as one race, by their straight glossy hair, thin beard, swarthy complexion, and cranial formation. Schoolcraft makes four groups; the first extending across the northern end of the continent; the second, tribes living east of the Mississippi; the third, those between the Mississippi and the Rocky Mountains; and the fourth, those west of the Rocky Mountains. All these he subdivides into thirty-seven families; but so far as those on the Pacific Coast are concerned, he might as reasonably have made of them twice or half the number. All writers agree in giving to the nations of America a remote antiquity; all admit that there exists a greater uniformity between them than is to be found in the old world; many deny that all are one race. There is undoubtedly a prevailing uniformity in those physical characteristics which govern classification; but this uniformity goes as far to prove one universal race throughout the world, as it does to prove a race peculiar to America. Traditions, ruins, moral and physical peculiarities, all denote for Americans a remote antiquity. The action of a climate peculiar to America, and of natural surroundings common to all the people of the continent, could not fail to produce in time a similarity of physiological structure. [Sidenote: INDIVIDUALITY OF RACE.] The impression of a New World individuality of race was no doubt strengthened in the eyes of the Conquerors, and in the mind of the train of writers that followed, by the fact, that the newly discovered tribes were more like each other than were any other peoples they had ever before seen; and at the same time very much unlike any nation whatever of the old world. And so any really existing physical distinctions among the American stocks came to be overlooked or undervalued. Darwin, on the authority of Elphinstone, observes that in India, "although a newly arrived European cannot at first distinguish the various native races, yet they soon appear to him entirely dissimilar; and the Hindoo cannot at first perceive any difference between the several European nations."