If this ground were tenable, we should find a world full of women who never lifted a finger save in the service of their children, and of men who did _all_ the work besides, and waited on the women whom motherhood prevented from waiting on themselves. The ground is not tenable. A human female, healthy, sound, has twenty-five years of life before she is a mother, and should have twenty-five years more after the period of such maternal service as is expected of her has been given. The duties of grandmotherhood are surely not alleged as preventing economic independence. The working power of the mother has always been a prominent factor in human life. She is the worker _par excellence_, but her work is not such as to affect her economic status. Her living, all that she gets,—food, clothing, ornaments, amusements, luxuries,—these bear no relation to her power to produce wealth, to her services in the house, or to her motherhood. These things bear relation only to the man she marries, the man she depends on,—to how much he has and how much he is willing to give her. The women whose splendid extravagance dazzles the world, whose economic goods are the greatest, are often neither houseworkers nor mothers, but simply the women who hold most power over the men who have the most money. The female of genus homo is economically dependent on the male. He is her food supply. II. Knowing how important a factor in the evolution of species is the economic relation, and finding in the human species an economic relation so peculiar, we may naturally look to find effects peculiar to our race. We may expect to find phenomena in the sex-relation and in the economic relation of humanity of a unique character,—phenomena not traceable to human superiority, but singularly derogatory to that superiority; phenomena so marked, so morbid, as to give rise to much speculation as to their cause. Are these natural inferences fulfilled? Are these peculiarities in the sex-relation and in the economic relation manifested in human life? Indisputably these are,—so plain, so prominent, so imperiously demanding attention, that human thought has been occupied from its first consciousness in trying some way to account for them. To explain and relate these phenomena, separating what is due to normal race-development from what is due to this abnormal sexuo-economic relation, is the purpose of the line of study here suggested. As the racial distinction of humanity lies in its social relation, so we find the distinctive gains and losses of humanity to lie also in its social relation. We are more affected by our relation to each other than by our physical environment.