soil have as yet been little assimilated to Americanism. This great body of aliens, representing perhaps a fifth of the population, is not a pool to be absorbed, but a continuous, inflowing stream, which until the outbreak of the Great War was steadily increasing in volume, and of which the fountain-head is so inexhaustible as to appal the imagination. From the beginning of the century, the inflow averaged little less than a million a year, and while about one-fifth of this represented a temporary migration, four-fifths of it meant a permanent addition to the population of the New World.
The character of this stream will inevitably determine to a large extent the future of the American nation. The direct biological results, in race mixture, are important enough, although not easy to define. The indirect results, which are probably of no less importance to eugenics, are so hard to follow that some students of the problem do not even realize their existence.
The ancestors of all white Americans, of course, were immigrants not so very many generations ago. But the earlier immigration was relatively homogeneous and stringently selected by the dangers of the voyage, the hardships of life in a new country, and the equality of opportunity where free competition drove the unfit to the wall. There were few people of eminence in the families that came to colonize North America, but there was a high average of sturdy virtues, and a good deal of ability, particularly in the Puritan and Huguenot invasions and in a part of that of Virginia.
In the first three-quarters of the nineteenth century, the number of these "patriots and founders" was greatly increased by the arrival of immigrants of similar racial stocks from Ireland, Germany, Scandinavia, and to a less extent from the other countries of northern