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.

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.

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

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

In America the most widespread type of forest is the evergreen coniferous woodland of the north.

No part of the world can be truly understood without a knowledge of its garment of vegetation, for this determines not only the nature of the animal inhabitants but also the occupations of the majority of human beings.

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.