came by way of Behring Straits and spread southward. They found caribou, the American reindeer, in the north and great herds of bison in the south. When they reached South America there were still living the Glyptodon, a gigantic armadillo, and the Megatherium, a monstrous clumsy sloth as high as an elephant. They probably exterminated the latter beast, which was as helpless as it was big.
The greater portion of these American tribes never rose above a hunting nomadic Neolithic life. They never discovered the use of iron, and their chief metal possessions were native gold and copper. But in Mexico, Yucatan and Peru conditions existed favourable to settled cultivation, and here about 1000 B.C. or so arose very interesting civilizations of a parallel but different type from the old-world civilization. Like the much earlier primitive civilizations of the old world these communities displayed a great development of human sacrifice about the processes of seed time and harvest; but while in the old world, as we shall see, these primary ideas were ultimately mitigated, complicated and overlaid by others, in America they developed and were elaborated, to a very high degree of intensity. These American civilized countries were essentially priest-ruled countries; their war chiefs and rulers were under a rigorous rule of law and omen.
These priests carried astronomical science to a high level of accuracy. They knew their year better than the Babylonians of whom we shall presently tell. In Yucatan they had a kind of writing, the Maya writing, of the most curious and elaborate character. So far as we have been able to decipher it, it was used mainly for keeping the exact and complicated calendars upon which the priests expended their intelligence. The art of the Maya civilization came to a climax about 700 or 800 A.D. The sculptured work of these people amazes the modern observer by its great plastic power and its frequent beauty, and perplexes him by a grotesqueness and by a sort of insane conventionality and intricacy outside the circle of his ideas. There is nothing quite like it in the old