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

The whole history of life is a record of cycles.

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

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

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.

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 Negro, however, has been tested on an extensive scale.