=3. The People of Ancient America.=--Wise men who have made a special study of the subject tell us that this country has been continuously inhabited by generations of men for many thousands of years. Rude tools, and human skulls, intermingled with bones of animals of species long extinct, have been found in caves or dug out of deep layers of earth; and they indicate that in the Mississippi valley and on the Atlantic and Pacific slopes there lived, perhaps hundreds of ages ago, men of a low grade of culture. In the great museums--as the Smithsonian Institution at Washington, the Peabody Museums at Cambridge and New Haven, and the natural history rooms at New York and elsewhere--may be seen thousands of the relics of vanished races of men and animals that once inhabited this continent. =4. The Red Men or Indians.=--The Indians constitute a race by themselves. Whether they are descended from some of those prehistoric inhabitants of whom we have just spoken no one can say; but they make up an American type with marks as clearly recognized as those that distinguish the Mongolians and the Malays. For long ages the red men had spread themselves over the two continents, from Hudson Bay to Cape Horn. With few or no exceptions, all had the same copperish or cinnamon color, deep-set and intensely black eyes, high cheek-bones, straight black hair, with little or no beard; but the long lapse of time, the great varieties of environment, and perhaps other causes, brought about striking differences of appearance, of manners, customs, dialects, and the like. =5. Three Principal Divisions of the Indians.=--The eminent historian, Dr. John Fiske, groups the Indians in three leading divisions,--as savage, barbarous, and half-civilized. The savage Indians ranged to the west of Hudson Bay, and southward between the Rocky Mountains and the Pacific, to the northern part of Mexico. They lived by catching fish or game. They knew little or nothing of tilling the soil. They did not dwell in permanent villages, but roamed from place to place like Bedouin Arabs. [Illustration: ANCIENT CLIFF DWELLINGS.] The barbarous Indians inhabited the country east of the Rocky Mountains. They did not depend wholly upon hunting or fishing, but knew how to upturn the soil slightly with rude tools, and raise squashes, beans, tomatoes, and, most important of all, Indian corn. They lived in villages, and made houses that would last several years. They had dogs of an inferior breed, but no other domestic animals. Some tribes were able to weave coarse cloth and make weapons of polished stones. They had strange social customs and singular religious beliefs. Fighting was their principal occupation.