Such a race-enhancing selection may, for example, take place through the tendency of young women of the present day to feel or retain love less and less for a man who is erotically divided, while, on the other hand, the men who have preserved unity in their love have more and more prospect of being attractive to women. Thus, generation after generation, erotic unity may become more and more natural with men, as in the same way it has become so with women. Man’s desire for woman’s purity has determined his choice, and this choice has then through heredity further advanced the feelings of the next generation, until these have become the strongest in his erotic instincts. The clearest consciousness of the injustice of the different moral demands on man and woman; the most “liberal” view of woman’s right to the same freedom as man, are in this case unable to vanquish his instincts. When a man learns that the woman he loves has given herself to another before him, or that he shares her with another, his feeling often becomes diseased at its root: the will of sole possession that has grown up in him through the love-selection of thousands of years, and has now been further heightened by the desire for unity of individual love. These indications may be enough to show the superficiality of the conclusions about love’s selection which are confined exclusively to physical improvement, although naturally this also is of great value. But that a pair of lovers can have a feeble-bodied child ought in itself to be no more used as evidence against love’s selection than would be the physically excellent children of an unhappy couple. Even if the erotic attraction of dissimilarities is thus the strongest proof of the probability of love’s influence from the point of view of the enhancement of the race, it is nevertheless far from being the only one. Another is the astonishing excess of first-born or only children among distinguished personalities in different departments. A third is the proverbial ability of so-called “love-children.” A fourth, the result, often favourable to the disposition of the children, of marriages between people of different nationalities. In the first two cases we may suppose that the parents’ happiness in love—or at least their sensual passion—was at the height of its freshness and strength at the conception of the child. In the case of “love-children” it is not unfrequently a healthy woman of the people who with genuine devotion encounters the sensual desire of a man intellectually her superior. In the last case, again, it is usually a powerful love which has conquered the obstructions raised by patriotism and traditions against the attraction by means of which the national contradictions are to be blended in the child into a happy unity.