the facts which will make better breeds of plants and animals by direct application of the biological laws of heredity; but they should present and apply parallel facts to human life in order to influence first of all individual responsibility for ethical control of reproductive activity, and thus indirectly work eugenically for an improved human race. [Sidenote: Aim of eugenics.] Thus the aim of eugenics is most likely to be attained through ethical rather than biological application of the teaching which our schools can give. The men and women who view life selfishly with no feelings of ethical responsibility towards others of the present or future will take no practical interest in the biological problems of human eugenics, although the economic problems of plant and animal breeding may interest some of these same people. [Sidenote: Education and other aspects of sex problems.] In addition to the ethical-social bearings of biological teaching, our sex-education will be incomplete until we learn how to attack the sex problems directly and effectively with reference to the ethical, social, psychical, and aesthetic aspects. Perhaps we may be able to do this only with mature people; probably it is too much to hope that even a serious impression will be made on all intelligent people; but somehow sex-education must be completed by adequate presentation of these aspects, for the problems of sex are satisfactorily solved only in the lives of those fortunate individuals whose vision of the relation of sex and life combines the viewpoints of biology, hygiene, psychology, ethics, religion, and last--but far from least--aesthetics. [Sidenote: Only essential knowledge of social diseases.]