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

Geologists are rapidly becoming convinced that the mammals spread from their central Asian point of origin largely because of great variations in climate.

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

With every throb of the climatic pulse which we have felt in Central Asia,, the centre of civilisation has moved this way and that. Each throb has sent pain and decay to the lands whose day was done, life and vigour to those whose day was yet to be.

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

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.

History in its broadest aspect is a record of man's migrations from one environment to another.