On the other hand, the mental diversity of men and women is equally fundamental. It is rooted in organisation. The well-intentioned efforts of many pioneers in women's movements to treat men and women as identical, and, as it were, to force women into masculine moulds, were both mischievous and useless. Women will always be different from men, mentally as well as physically. It is well for both sexes that it should be so. It is owing to these differences that each sex can bring to the world's work various aptitudes that the other lacks. It is owing to these differences also that men and women have their undying charm for each other. We cannot change them, and we need not wish to. [1] See, for instance, Blair Bell's _The Sex Complex_, 1916, though the deductions drawn in this book must not always be accepted without qualifications. [2] G. Fritsch, _Die Eingeborene Sued-Afrikas_, 1892, p. 79. [3] 1 D.R. Malcolm Keir, "Women in Industry," _Popular Science Monthly_, October, 1913. [4] See, for many of the chief of these, Havelock Ellis, _Man and Woman_, 5th Edition, 1914. [5] W.P. Pycraft, _The Courtship of Animal_, p. 9. X THE WHITE SLAVE CRUSADE During recent years we have witnessed a remarkable attempt--more popular and more international in character than any before--to deal with that ancient sexual evil which has for some time been picturesquely described as the White Slave Traffic. Less than forty years ago Professor Sheldon Amos wrote that this subject can scarcely be touched upon by journalists, and "can never form a topic of common conversation." Nowadays Churches, societies, journalists, legislators have all joined the ranks of the agitators. Not only has there been no voice on the opposite side, which was scarcely to be expected--for there has never been any anxiety to cry aloud the defence of "White Slavery" from the house-tops--but there has been a new and noteworthy conquest over indifference and over that sacred silence which was supposed to encompass all sexual topics with suitable darkness. The banishment of that silence in the cause of social hygiene is, indeed, not the least significant feature of this agitation. It is inevitable, however, that these periodical fits of virtuous indignation by which Society is overtaken should speedily be spent. The victim of the moral fever finds himself exhausted by the struggle, scarcely able to cope with the complications of the disease, and, at the best, only too anxious to forget what he has passed through. He has an uneasy feeling that in the course of his delirium he has said and done many foolish things which it would now be unpleasant to recall too precisely.