Later on, the different laws and customs to which the so-called sexes are subjected press them as by a vice into distinctive moulds. The proposals which should follow from my conclusions will encounter more passive resistance, I fear, in the case of girls than in that of boys. I must here contradict, in the most positive fashion, a dogma that is authoritatively and widely maintained at the present time, the idea that all women are alike, that no individuals exist amongst women. It is true that amongst those individuals whose constitutions lie nearer the female side than the male side, the differences and possibilities are not so great as amongst those on the male side; the greater variability of males is true not only for the human race but for the living world, and is related to the principles established by Darwin. None the less, there are plenty of differences amongst women. The psychological origin of this common error depends chiefly on a fact that I explained in chap. iii., the fact that every man in his life becomes intimate only with a group of women defined by his own constitution, and so naturally he finds them much alike. For the same reason, and in the same way, one may often hear a woman say that all men are alike. And the narrow uniform view about men, displayed by most of the leaders of the women’s rights movement depends on precisely the same cause. It is clear that the principle of the existence of innumerable individual proportions of the male and female principles is a basis of the study of character which must be applied in any rational scheme of pedagogy. The science of character must be associated with some form of psychology that takes into account some theory of the real existence of mental phenomena in the same fashion that anatomy is related to physiology. And so it is necessary, quite apart from theoretical reasons, to attempt to pursue a psychology of individual differences. This attempt will be readily enough followed by those who believe in the parallelism between mind and matter, for they will see in psychology no more than the physiology of the central nervous system, and will readily admit that the science of character must be a sister of morphology. As a matter of fact there is great hope that in future characterology and morphology will each greatly help the other. The principle of sexually intermediate forms, and still more the parallelism between characterology and morphology in the widest application, make us look forward to the time when physiognomy will take its honourable place amongst the sciences, a place which so many have attempted to gain for it but as yet unsuccessfully.