First, the skeleton. The entire female skeleton differs from the male skeleton; all the bones are smaller and more gracile; the pelvis, as we have seen before, is shallower and wider. Then the muscles are smaller and more rounded. The entire contour of the body is rounded rather than angular as in man. The skin is finer, softer, more delicate. The hair on the head is longer and of a finer texture, while over the body the hair is also finer and less abundant. The voice is finer, more pleasant, and of a higher pitch (soprano). The breasts are well developed, and serve an important purpose, while in men they are rudimentary. The breathing is also different; woman breathes principally with the upper part of the chest, man with the lower. The brain is smaller and its convolutions somewhat less complex in woman. Woman differs considerably from man not only physically, as we have seen, but also mentally and emotionally. But into this phase of the subject we will not enter, except to remark that it is foolish to speak of the superiority or inferiority of one sex to another. In some respects man is greatly superior to woman, in others he is inferior; on the whole the sexes balance one another pretty well, and while the sexes are not and never will be exactly alike, we have no right to speak of the inferiority of one sex to another. We recognize that the sexes are different, but they complement one another, and the claim of the reactionary and of the woman-hater that woman is an inferior creature is just as senseless as is the claim made by some ultra-militant feminists that woman is the superior and man the inferior. FOOTNOTES: [3] The ovum is really the fully mature egg ready for fecundation; before maturity it should not be called ovum but ooecyte; and in advanced treatises it is so referred to. But here ovum will do for both the unripe and ripe egg. CHAPTER FOUR THE SEX INSTINCT Universality of the Sex Instinct--Not Responsible for Our Thoughts and Feelings. THE sex instinct, which runs all through nature from the lowest animal to the highest, is the inborn impulse, craving or desire which one sex has for the other: the male for the female and the female for the male. This instinct, this desire for the opposite sex, which is born with us and which manifests itself at a very early age, is not anything to be ashamed of. There is nothing disgraceful, nothing sinful in it. It is a normal, natural, healthy instinct, implanted in us by nature for various reasons, and absolutely indispensable for the perpetuation of the race. If there were anything to be ashamed of, it would be the lack of this sex instinct, for without it the race would quickly die out.