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

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

The coast of British Columbia was one of the three chief centers of aboriginal America.

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

Thus the races, though alike in their physical response to climate, may possibly be different in their mental response because they have approached America by different paths.

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.

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