beauty and force of the passions that we have inherited. We shall find also the causes, so important to us, which led to the reversal of the early superiority of the female in size and often in function, replacing it by the superiority of the male. Then, and then only, shall we be ready to approach the difficult problems of the sexual differences which have persisted, separating women from men among human races, and to estimate if these differences are to be considered as belonging essentially to the female and the male, or whether they have arisen through special environmental causes. If we look back anew to the very start of sexuality, where two cells flow together, thereby to continue life, we find the very simplest expression of the sex-appetite. There is what may be called instinctive physical attraction, and the whole process is very much a satisfaction of protoplasmic hunger.[39] Now it was, of course, a long step from this incipient cell-union to the varied function of sex in animal life, and it was a long process from these to the yet more complex manifestation of the love-passion among men. But in reality the source of all love is the same; throughout the entire relations of the sexes we find this cell-hunger instinct; in every case, it matters not how fine and ennobling the love may be, the single, original, impelling motive is the union of two cells--the male element and the female driven to seek one another to continue life. I find it necessary to insist on this physical basis of all love. Women are so apt to go astray. It is one of the vicious tendencies of the female mind to think that the needs of sex are something to be resisted. Let us face the truth that this great force of love has its roots fastened in cell-hunger, and it dies when its roots are cut away. It is evident that at first this sex-appetite cannot have been purposive, but acted subconsciously by a kind of interaction between the want of the organism and its power of function. Even in many complex multicellular organisms the liberation of the sex-elements continues very passive; and although the differentiation of the sexual-cells is already complete in plants and animals comparatively low in the scale, it at first makes little difference in the development of the other parts of the individual. Among many lower animals, and most plants, each individual develops within itself both kinds of cells--that is, female and male. This union of the two sex functions in one organism is known as hermaphroditism. There is little doubt that it was once common to all organisms, an intermediate stage in the sex-progress, after the differentiation of the sexes had been accomplished.