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.

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

A journey of four hundred and thirty miles can be made in any part of the United States, but in Turkey it takes as many days.

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.

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

The whole history of life is a record of cycles.