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.

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.

Curiously enough man's body and his mind appear to differ in their climatic adaptations.

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

In America the most widespread type of forest is the evergreen coniferous woodland of the north.

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.

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.