Although farming of any sort was almost as impossible in the plains as in the dry regions of winter rains farther west, the abundance of buffaloes made life much easier in many respects.

The Negro, however, has been tested on an extensive scale.

Man could not stay there forever. He was bound to spread to new regions, partly because of his innate migratory tendency and partly because of Nature's stern urgency.

From first to last the civilization of America has been bound up with its physical environment.

We are learning, too, that the love of beauty is one of Nature's greatest healers.

Thus the races, though alike in their physical response to climate, may possibly be different in their mental response because they have approached America by different paths.

With every throb of the climatic pulse which we have felt in Central Asia,, the centre of civilisation has moved this way and that. Each throb has sent pain and decay to the lands whose day was done, life and vigour to those whose day was yet to be.