Co-operation in work to the banishment of idleness and its accompanying misery _ennui_ is the primary object of the new domestic system, but other ends to attain are—economy, by means of joint labour and joint expense to the relief of monetary anxieties and domestic worries; stability of social position, i.e. no member needing to fear that his home will break up independently of his wishes; social intercourse and enjoyment relieved of conventional etiquette or tyranny; freedom for friendship between the sexes and such conditions of family union as will promote mental capacity and altruistic sentiment in each individual; early marriage without disregard of social responsibility and based upon mutual knowledge of character, habits and tastes; a fitting refuge for old age, rendering impossible the premature destruction of valuable social forces which age alone can supply, and securing the material, intellectual and emotional surroundings necessary for comfort up to the last moment of life. In the lower social strata where any reconstruction of family life is not yet possible, what is immediately required is a gradual rise of wages with steady improvement in all the conditions of industrial labour. Society also must relinquish such patronage of the poor as fosters their too rapid increase, undermines their self-dependence and tends generally to deterioration of race. Parental responsibility must be strongly inculcated and strictly upheld. Public teaching should be given in all natural laws affecting society, especially the laws of health, increase, and heredity; and, under conditions respectful to human dignity, Malthusian doctrine should be taught, and a knowledge of neo-Malthusian method very carefully imparted. In the higher social strata within the newly constructed modern homes sexual conduct and parentage with its far-reaching results for good or evil must be controlled or guided into the path of racial regeneration. The scientific study of man’s nature gives sexual passion an honourable position relatively to human life. It rests on the conscience of each adult generation as an imperative social duty to influence the young generation in such wise as that this great passion shall subserve physical and social health and cease to create degradation. A due activity in growing organs strengthens organic function; therefore, with early marriages and freedom to young love, checked only by scientific knowledge of the laws of health, propagation at the age of maturity is bound to put forth vitality of good quality. In conscious evolution sexual functions are no longer regarded as essentially allied with propagation. They are regarded, however, as properly subject in youth to parental and social control; and that control acts as a perpetual restraint upon licentious, dissolute tendencies and a shield to the young love that seeks personal happiness consistent with domestic purity.