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.

Nevertheless most of the evergreen forests of the north must always remain the home of wild animals and trappers, a backward region in which it is easy for a great fur company to maintain a practical monopoly.

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

For the source of any characteristic so widespread and uniform as this adaptation to environment we must go back to the very beginning of the human race.

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

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