Love never yet went with self-interest. The deepest antagonism lies between them: they are diametrically opposed forces. In the beautiful progress of evolution we find constant opposition between the instincts and processes of self-preservation and the instinct and processes of race-preservation. From those early forms where birth brought death, as in the flowering aloe, the ephemeral may-fly, up to the highest glory of self-effacing love; these two forces work in opposition. We have tied them together. We have made the woman, the mother,—the very source of sacrifice through love,—get gain through love,—a hideous paradox. No wonder that our daily lives are full of the flagrant evils produced by this unnatural state. No wonder that men turn with loathing from the kind of women they have made. VI. The peculiar combination of functions which we are studying has not only an immediate effect on individuals through sex-action, and through the sex-affected individuals upon society, but also an effect upon society through economic action, and through the economically affected society upon the individual. The economic aspect of the question brings it prominently forward to-day as influencing not only our private health and happiness and the processes of reproduction, but our public health and happiness and the processes of social economics as well. Society is confronted in this age with most pressing problems in economics, and we need the fullest understanding of the factors involved. These problems are almost wholly social rather than physical, and concern not the capacity of a given society to produce and distribute enough wealth for its maintenance, but some maladjustment of internal processes which checks that production and distribution, and developes such irregular and morbid processes of innutrition, malnutrition, and over-nutrition as continually to injure the health and activity of the social organism. Our difficulty about wealth is not in getting it out of the earth, but in getting it away from one another. We have phenomena before us in the development of social economic relations analogous to those accompanying our development in sex-relation.