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.

Except on their southern borders the great northern forests are not good as a permanent home for man.

In fact, the history of North America has been perhaps more profoundly influenced by man's inheritance from his past homes than by the physical features of his present home.

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

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

As a matter of fact, an ordinary desert supports a much greater variety of plants than does either a forest or a prairie.

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