During the last year or two of the campaign against infant mortality many things have become clear, and none clearer than the fundamental compatibility between this campaign and the principles of eugenics. As these two efforts wall be predominant in the real politics of all the years to come, a few more words must here be devoted to the relation between them. Granted that the highest of all objects is the making of worthy human beings, it is quite evident that we must attend equally to the two factors which determine all human life--heredity and environment. Eugenics stands for the principle of heredity--the principle that the right children shall be born. The campaign against infant mortality stands for a good environment[4]--so that children, when born, may survive and thrive. Obviously eugenics would be of no use if the children could not survive, and no human infant can survive unless it be born into a moral environment: no motherhood, no man. The two campaigns, then, are strictly complementary. We must endeavour to rid ourselves of the popular notion that the whole result of the campaign against infant mortality can be measured by the number of babies whose death is prevented. The infant mortality is merely an index of a widespread social disease--an index and an extreme symptom. But for every baby killed many are damaged; and to remove the causes of infant mortality is to remove the causes which at present effect the deterioration of millions of human beings. The eugenic campaign, then, without the other would be almost futile.