species is constantly purged of its inefficient members.
Because of this, a premium is placed upon strength, and so long as the struggle for food and shelter obtains, just so long will the average strength of each generation increase. On the other hand, should conditions so change that all, and the progeny of all, the weak as well as the strong, have an equal chance for survival, then, at once, the average strength of each generation will begin to diminish. Never yet, however, in animal life, has there been such a state of affairs. Natural selection has always obtained. The strong and their progeny, at the expense of the weak, have always survived. This law of development has operated down all the past upon all life; it so operates today, and it
