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.

It will be a vast boon to mankind when we learn to prophesy the precise dates when cycles of various kinds will reach definite stages.

History in its broadest aspect is a record of man's migrations from one environment to another.

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

The buffalo is a surprisingly stupid animal.

Fertile soil, level plains, easy passage across the mountains, coal, iron, and other metals imbedded in the rocks, and a stimulating climate, all shower their blessings upon man.

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