"How, then, do you account for the fact that she has in all ages and countries since the dawn of history, with perhaps a few doubtful and transient exceptions, been his physical subject and thrall? If she ever was his equal, why did she cease to become so, and by a rule so universal? If her inferiority since historic times may be ascribed to unfavorable man-made conditions, why, if she was his equal, did she permit those conditions to be imposed upon her? A philosophical theory as to how a condition is to cease should contain a rational suggestion as to how it arose." "Very true indeed," replied the doctor. "Your question is practical. The theory of those who hold that woman will yet be man's full equal in physical vigor necessarily implies, as you suggest, that she must probably once have been his actual equal, and calls for an explanation of the loss of that equality. Suppose man and woman actual physical equals at some point of the past. There remains a radical difference in their relation as sexes--namely, that man can passionally appropriate woman against her will if he can overpower her, while woman can not, even if disposed, so appropriate man without his full volition, however great her superiority of force. I have often speculated as to the reason of this radical difference, lying as it does at the root of all the sex tyranny of the past, now happily for evermore replaced by mutuality. It has sometimes seemed to me that it was Nature's provision to keep the race alive in periods of its evolution when life was not worth living save for a far-off posterity's sake. This end, we may say, she shrewdly secured by vesting the aggressive and appropriating power in the sex relation in that sex which had to bear the least part of the consequences resultant on its exercise. We may call the device a rather mean one on Nature's part, but it was well calculated to effect the purpose. But for it, owing to the natural and rational reluctance of the child-bearing sex to assume a burden so bitter and so seemingly profitless, the race might easily have been exposed to the risk of ceasing utterly during the darker periods of its upward evolution.