One of the prime needs is to remember that almost every duty is composed of two seemingly conflicting elements, and that over-insistence on one, to the exclusion of the other, may defeat its own end.

Any man who studies the statistics of the birth-rate among the native Americans of New England, or among the native French of France, needs not to be told that when prudence and forethought are carried to the point of cold selfishness and self-indulgence, the race is bound to disappear.

Taking into account the women who for good reasons do not marry, or who when married are childless or are able to have but one or two children, it is evident that the married woman able to have children must on an average have four or the race will not perpetuate itself.

This is the mere statement of a self-evident truth.

Yet foolish and self-indulgent people often resent this statement as if it were in some way possible by denunciation to reverse the facts of nature; and, on the other hand, improvident and shiftless people, inconsiderate and brutal people, treat the statement as if it justified heads of families in having enormous numbers of badly nourished, badly brought up, and badly cared for children for whom they make no effort to provide.