Eugenics is the study of the agencies under social control that may improve or impair the racial qualities of future generations either physically or mentally.

The conditions that direct the order of . . . the living world . . . are marked by their persistence in improving the birthright of successive generations.

All male animals, including men, when they are in love, are apt to behave in ways that seem ludicrous to bystanders.

Life is a republic where the individuals are for the most part unconscious that while they are working for themselves they are also working for the public good.

The object . . . is to discover methods of condensing information concerning large groups of allied facts into brief and compendious expressions suitable for discussion.

It is always the case with the best work, that it is misrepresented, and disparaged at first, for it takes a curiously long time for new ideas to become current, and the older men who ought to be capable of taking them in freely, will not do so through prejudice.

One of the effects of civilization is to diminish the rigour of the application of the law of natural selection. It preserves weakly lives that would have perished in barbarous lands.