As soon as men and women acquire the knowledge that their choices in marriage largely determine whether or not their physical and mental faults and virtues will reappear in children, they feel a sacred responsibility in that act of choosing. A little conscious knowledge of what kind of combinations of traits bring about their reappearance in offspring can not help but modify a person's taste, and thus automatically direct the choice of a mate, which choice will still be, and rightfully, an instinctive one. Upon the wisdom with which choices in marriage are now made depends in large degree the health and efficiency of all the individuals who will constitute society in the coming generations. As the science of eugenics gathers a greater wealth of evidence and subjects it to vigorous analysis, its ability to guide the race to higher levels will become more positive and far-reaching. This can be done without surrendering the general principle of individual freedom. It will not reduce but increase the number of natural love-marriages. The errors of crude and superficial or overenthusiastic eugenists should not obscure the enormous possibilities of the science for the human race. Eugenic knowledge is, therefore, not only a personal advantage but a social necessity. [Sidenote: Social Progress] For society as a whole, a thoroughgoing eugenic program must include: (1) The prevention of reproduction by the markedly unfit, such as the feeble-minded, by sterilization of the most unfit and by segregating the remainder in public institutions. (2) The enactment of wise marriage laws. (3) The development of an enlightened sentiment against improper marriages and the putting at the disposal of individuals contemplating marriage the data accumulated and principles worked out by eugenic students. The Eugenics Record Office of Cold Spring Harbor, Long Island, N. Y., is now engaged in collecting such material. For us of the present generation, hygiene is of immediate concern; but if we are to build for future generations, hygiene must give way to, or grow into, eugenics. The accomplishment of a true eugenic program will be the crowning work of the health movement and the grandest service of science to the human race. (For further comments on this subject see "Eugenics" in SUPPLEMENTARY NOTES.) SUPPLEMENTARY NOTES ON SPECIAL SUBJECTS SECTION I NOTES ON FOOD [Sidenote: Balancing the Diet] It will help to balance the ration and to avoid an excess of protein and also to avoid a deficiency of either fat or carbohydrate, if we take a bird's-eye view of the various common foods in respect to the protein, fat and carbohydrate they contain. For this purpose the following table has been constructed. [Sidenote: Common Foods Classified]