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Rh observations on human beings first led me to my results, I shall begin with this side of the subject.

Everyone possesses a definite, individual taste of his own with regard to the other sex. If we compare the portrait of the women which some famous man has been known to love, we shall nearly always find that they are all closely alike, the similarity being most obvious in the contour (more precisely in the "figure") or in the face, but on closer examination being found to extend to the minutest details, ad unguem, to the finger-tips. It is precisely the same with every one else. So, also, every girl who strongly attracts a man recalls to him the other girls he has loved before. We see another side of the same phenomenon when we recall how often we have said of some acquaintance or another, "I can't imagine how that type of woman pleases him." Darwin, in the "Descent of Man," collected many instances of the existence of this individuality of the sexual taste amongst animals, and I shall be able to show that there are analogous phenomena even amongst plants.

Sexual attraction is nearly always, as in the case of gravitation, reciprocal. Where there appear to be exceptions to this rule, there is nearly always evidence of the presence of special influences which have been capable of preventing the direct action of the special taste, which is almost always reciprocal, or which have left an unsatisfied craving, if the direct taste were not allowed its play.

The common saying, "Waiting for Mr. Right," or statements such as that "So-and-so are quite unsuitable for one another," show the existence of an obscure presentiment of the fact that every man or woman possesses certain individual peculiarities which qualify or disqualify him or her for marriage with any particular member of the opposite sex; and that this man cannot be substituted for that, or this woman for the other without creating a disharmony.

It is a common personal experience that certain individuals of the opposite sex are distasteful to us, that others leave us cold; whilst others again may stimulate us until, at last,