We are learning, too, that the love of beauty is one of Nature's greatest healers.

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

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.

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

The geysers and hot springs of the Yellowstone are another proof of recent volcanic activity.

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