What ought to be insisted upon even now is that each party before marriage should possess full knowledge of its possible dangers, but that the choice should thereupon be left to their own sense of responsibility. No one—at least not yet—can ask the individual to sacrifice his happiness for contested possibilities; but in the interests of the individual, as of that of the race, we can, on the other hand, demand that no one shall make his choice in love in ignorance. And the more the sense of racial community approaches its renaissance under the influence of evolutionism, the more natural will all safeguards appear with which that choice may be surrounded to the advantage of posterity. Even now it is considered quite natural that a medical examination should precede life insurance. In the future it may be equally obvious that before marriage the woman should ascertain from a female doctor and the man from a male doctor whether they are capable of fulfilling their duty to the race. And it is not only a question of insuring the new lives, but also of assuring the couple themselves that they have no organic defects which in some instances might make marriage impossible, which in others are easily avoidable, but ignorance regarding which would in each case entail unnecessary suffering. In most cases it is the anxiety of one’s self contracting or transmitting diseases to the other party and to the children that the physician has to confirm or dispel. It is beyond all question that healthy selfishness, which desires to preserve its own individuality, as well as the growing appreciation of a worthy offspring, will then hinder many an unsuitable marriage. In other cases love might triumph over these considerations for its own part, the married couple abstaining, however, from parentage. In those cases, again, where the law would definitely forbid marriage, this would doubtless be no hindrance to diseased people having offspring outside wedlock. But the same is true, of course, of all legal enactments: the best people do not require them, the worst do not obey them, but through them the ideas of justice of the majority are cultivated. Only those who are ignorant of the laws of psychological transformation doubt the possibility of the simultaneous enhancement of the feeling of love and the racial sense. Century after century the emotion of love has been growing, while at the same time men have nevertheless sacrificed it to religious prejudices, superficial ideas of duty, tyrannical parental authority, and empty forms. Now, when the sacrifice is called for on behalf of the highest of possible gains—the conquest of disease by health, the ennobling of the human body itself—now, of all times, it is asserted that mankind would be incapable of this sacrifice—because in the course of time the power of love has increased.