As regards will power, woman is, in my opinion, on the average superior to man. It is in this psychological domain more than in any other, that she will always triumph. This is generally misunderstood, because men have so far apparently held the scepter of an unlimited omnipotence; because by the abuse of brute force, aided by superiority of inventive genius, humanity has been hitherto led by strong masculine wills, and because the strongest feminine wills have been dominated by the law of the right of the stronger. But the unprejudiced observer is soon obliged to recognize that the directive will of the family is only, in general, represented externally by the master. Man parades his authority much more often than he puts it into practice; he lacks the perseverance, tenacity and elasticity which constitute the true power of will, and which are peculiar to woman. It is needless to say that I am only speaking of the average and that there are many women whose will power is feeble. But these easily become the prey of prostitution, which causes their disappearance. This is perhaps one of the causes which have strengthened by selection the will power in women. Man is impulsive and violent as regards his will power, but often inconstant and irresolute, yielding as soon as he has to strive persistently for a certain object. From these facts it naturally results that, on the average, it is the man in the family who provides the ideas and impulses, but the woman who, with the finesse of her tact and perseverance, instinctively makes the distinction between the useful and the harmful, utilizing the former and constantly combating the latter; not because she is fundamentally superior, but because she is more capable of dominating herself, which proves the superiority of her will power. Nothing is more unjust than to disparage one sex relatively to the other. The parthenogenesis of the lower animals having ceased in the vertebrates, each sex is indispensable, not only to the preservation of species, but also to each conception or reproduction of the individual. Both are thus equivalent and belong to each other as the two halves of a whole, one being incapable of resisting without the other. Everything which benefits one of the halves benefits the other. If by the magic wand of a fairy, the male half or the female half of our humanity, such as it is to-day, was rendered capable and obliged to reproduce alone, men would soon degenerate owing to the weakness of their will combined with their sensual passions, and women from their incapacity to raise their intellectual level by means of creative ideas.