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.

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.

The human organism inherits so delicate an adjustment to climate that, in spite of man's boasted ability to live anywhere, the strain of the frozen North eliminates the more nervous and active types of mind.

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

Although mountains may guide migrations, the plains are the regions where people dwell in greatest numbers.

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

Year by year we are learning that in this restless, strenuous American life of ours vacations are essential.