In speaking of the relation of sex to morality,[255] I have already shown that the morality of man is peculiarly a morality of prowess and contract, while woman's morality is to a greater degree a morality of bodily habits, both because child-bearing, which is a large factor in determining sexual morality, is more closely connected with her person, and in consequence also of male jealousy. Physiologically and socially reproduction is more identified with the person of woman than of man, and it has come about that her sexual behavior has been more closely looked after, not only by men, but by women--for it would not be difficult to show that women have been always, as they are still, peculiarly watchful of one another in this respect. In the course of history woman developed an excessive and scrupulous concern for the propriety of her behavior, especially in connection with her bodily habits; and this in turn became fixed and particularized by fashion, with the result that not only her physical life became circumscribed, but her attention and mental interests became limited largely to safeguarding and enhancing her person. The effect of this and of other similar restrictions of behavior on her character and mind is indicated in following chapters. THE ADVENTITIOUS CHARACTER OF WOMAN There is more than one bit of evidence that nature changed her plan with reference to some organism at the very last moment, and introduced a feature which was not contemplated at the outset. This change of plan is carried out through the specialization of some organ, sense, or habit, to such a degree as to make practically a new type of the organism. In the human species, for example, the atrophied organs distributed through the body are evidence that the physical make-up of the species was well-nigh definitely fixed before the advantage of free hands led to an erect posture, thereby throwing certain sets of muscles out of use; and the specialization of the voice as a means of communicating thought was, similarly, a device for relieving the hands of the burden of communication, and was not introduced systematically until a gesture language had been so well established that even now we fall back into it unconsciously, especially in moments of excitement, and attempt to talk with our hands and bodies.