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There are all kinds and conditions and sorts of men and women, and all kinds and sorts and conditions of the normal, because an incalculable number of harmonious relations and interactions between the endocrines are possible, and do actually occur.
Predisposition in any direction will probably be shown to be caused by them, within limits. Research here has its opportunity. A vast new territory of inquiry and achievement, as yet totally unexplored, is opened by the endocrines to the eugenists, and those idealists whose most earnest aspiration is the improvement of racial stock as a necessary preliminary to improvement of racial life.
So it is with the associated reactions of the internal secretions. A stimulus originally indifferent to the endocrines may, by association, the laws of which are many, come to act like a spark to the endocrine-instinct mechanism. Hence we can account for the subtle play of instinct throughout all thinking.
Similarly, the males, when their sex endocrines are cut off, will change their psychic nature as well as physically. Besides owning his flag-waving comb, his spurs and brighter feathers, the rooster struts to attract the female, and fights aggressively with his sex competitors.
Among historic castrates, eunuchs, not a single example of great intellect, of the creative type, is known. On the contrary, the native gifts of the mind were destroyed. Thus Abelard, who was punished with castration by his uncle for his love affair with Helöise, never composed a verse of poetry thereafter. That brings us to the consideration of imagination as influenced by the endocrines.
Since, too, muscle attitudes, muscle tensions and muscle relaxations play so large a part in the production of fundamental mental states: the attitudes, moods, memories and will reactions, the vegetative apparatus enters, to play its part as a determinant. Over no domain of the body have the endocrines a more absolute mandatory than over that of the whole complex of sex.
If he does not destroy himself before, that is surely his destiny. For better or for worse, we possess now in the endocrines new instruments for swaying the individual as individual, and as related to other individuals, as a member of a type, family, nation, species and genus. The sense of likeness and the sense of unlikeness plays a decisive rôle in the diurnal schedule of the individual.
We shall have to consider this in greater detail when we analyze the internal secretion basis of masculinity and femininity. In general, the degree of general hairiness is an index to the amount of adrenal influence upon the organism. All the endocrines which affect the hair growth also act upon the sebaceous glands which oil the skin.
For ten lunar months, not another ovum breaks through the covering of the ovary, and the uterus is left undisturbed. The placental secretion plays a most important rôle as brake upon the post-pituitary, the most active of the feminizing uterus-disturbing endocrines.
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