Much more space might be spent upon this gravest of problems for the eugenist--the fact that the very persons from whom he desires to recruit the future on account of their greater individuality are also on that very account the persons who, by natural necessity, tend to be less fertile. The difficulty shows itself in the male sex, but it shows itself still more conspicuously in the female sex, where the proportion of the individual energy devoted to the race, as compared with that devoted to individuation, is necessarily far higher, and must so remain if the race is to persist. Primarily, the body of woman is the temple of life to come--and _therefore_, as we shall some day teach our girls, the holy of holies. Without going further into this matter now, it may be suggested that a cardinal principle of practical importance is involved. It is that the individual development of women, their higher education, their self-expression in works of art and thought and practice, cannot safely be carried to the point at which motherhood is compromised; else the race in question will necessarily disappear and be replaced by any race whatsoever, the women of which continue to be mothers. There are women of the worker bee type whom this argument annoys intensely. No one wants _them_ to be mothers. The proposition that all progress in the psychical world depends upon individuality, just as all organic progress, and indeed, all organic evolution, depends upon the physical individuality which biologists call variation, may suggest to the reader the importance which must attach to our study of talent and genius, and the possibility of aiding their production. Meanwhile, we must look a little further at the general question of individuality or quality _versus_ quantity from the international point of view.