Soon after America was proved not to be part of Asia, a puzzling question arose. Whence came these "Indians", and in what manner did they find their way to the western hemisphere. Since the beginning of the present century discoveries in geology have entirely altered our mental attitude toward this question. It was formerly argued upon the two assumptions that the geographical relations of land and water had been always pretty much the same as we now find them, and that all the racial differences among men have arisen since the date of the "Noachian Deluge", which was generally placed somewhere between two and three thousand years before the Christian era.
