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

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.

Nevertheless most of the evergreen forests of the north must always remain the home of wild animals and trappers, a backward region in which it is easy for a great fur company to maintain a practical monopoly.

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

For the source of any characteristic so widespread and uniform as this adaptation to environment we must go back to the very beginning of the human race.

America forms the longest and straightest bone in the earth's skeleton.

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