"We would guard against the temptation to sum up the contrast of the sexes in epigrams. We regard the woman as relatively more anabolic, man as relatively more katabolic, and whether this biological hypothesis is a good one or not, it certainly does no social harm. But when investigators begin to say that woman is more infantile and man more senile, that woman is "undeveloped man" and man is "evolved woman," we get among generalisations not only unscientific but practically dangerous. Not the least dangerous of these generalisations is one of the most familiar, that man is more variable than woman, that the raw materials of evolution make their appearance in greatest abundance in man. There seems to be no secure basis for this generalisation; it seems doubtful whether any generalisation of the kind is feasible. Prof. Karl Pearson has made seventeen groups of measurements of different parts of the body, in eleven groups the female is more variable than the male, and in six the male is more variable than the female. _Moreover the differences of variability are slight, less than those between members of the same race living in different conditions._ Furthermore, an elementary remark may be pardoned. Since inheritance is bi-parental, and since variation means some peculiarity in the inheritance, a greater variability in men, if true, would not mean that men had any credit for varying. The stimulus to variation may have come from the mother as well as the father. _If proved it would only mean that the male constitution gives free play to the expression of variations, which are kept latent in the female constitution._ But what is probably true is that some variations find expression more readily in man and others more readily in woman." The italics in the passage are mine, for they make abundantly clear the falseness of the old view, and show how much the question needs reopening from the common-sense standpoint of opportunity. I shall, therefore, only restate my opinion that it is impossible to assume a fundamental difference in individuality as existing between woman and man until it can be proved that the same free-play to the expression has been common alike to both sexes.