masculine till it is time to be. Childhood is not the period for these marked manifestations of sex. That we exhibit them, that we admire and encourage them, shows our over-sexed condition. IV. Having seen the disproportionate degree of sex-distinction in humanity and its greater manifestation in the female than in the male, and having seen also the unique position of the human female as an economic dependant on the male of her species, it is not difficult to establish a relation between these two facts. The general law acting to produce this condition of exaggerated sex-development was briefly referred to in the second chapter. It is as follows: the natural tendency of any function to increase in power by use causes sex-activity to increase under the action of sexual selection. This tendency is checked in most species by the I force of natural selection, which diverts the energies into other channels and developes race-activities. Where the female finds her economic environment in the male, and her economic advantage is directly conditioned upon the sex-relation, the force of natural selection is added to the force of sexual selection, and both together operate to develope sex-activity. In any animal species, free from any other condition, such a relation would have inevitably developed sex to an inordinate degree, as may be readily seen in the comparatively similar cases of those insects where the female, losing economic activity and modified entirely to sex, becomes a mere egg-sac, an organism with no powers of self-preservation, only those of race-preservation. With these insects the only race-problem is to maintain and reproduce the species, and such a condition is not necessarily evil; but with a race like ours, whose development as human creatures is but comparatively begun, it is evil because of its check to individual and racial progress. There are other purposes before us besides mere maintenance and reproduction.