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Updated: May 20, 2025
Upon the basis of these structural, functional and mental differences, the qualitative and quantitative evolution of which in the race as in the individual is guided by the glands of internal secretion, Keith presents a very good case for the view that the white man is an example of relative excess of the pituitary, thyroid, adrenal and gonad endocrines.
In the family, as nature's laboratory for the manufacture of fresh combinations of the internal secretions, allowances will be made for divergences in capacity and deportment from a new angle altogether. Schools will function as the developers, stimulators and inhibitors of the endocrines, as well as investigators of the individuals who have not enough or too much of one or some of them.
And it may show us a source for a good deal of the material of dreams and dream states. We have said that we think and we remember, not alone with the brain, but with the muscles, the viscera and the endocrines. So do we forget not alone with the brain, but with the muscles, the viscera, the endocrines and their nerves.
The skin is influenced in its color, moisture, hairiness, texture, fat content and disease vulnerability by the endocrines. The question of color is very interesting, for it is probably the expression of the blending action of the different internal secretions.
Nowadays, these women are striding forward and will attain a good many of the masculine heights, commanding responsible executive positions and high salaries. An adrenal type will probably be the first woman president of the United States. However, that presupposes a normal range of action of the other endocrines.
The information furnished by the study of the endocrines concerning the genesis of personality provides the foundations for a positive eugenics, a eugenics of the encouragement of desirable matings, with the proper legal and social procedures. Selective breeding for the production of the best endocrine types should become practicable. But the biologist should be able to go farther.
All the different nuances of personality are expressions of a particular relationship, transitory or permanent, between the endocrines and the viscera and muscles. Conversely, behaviour shows what a person actually is chemically; that is, what endocrine and vegetative factors predominate in his make-up. Fear and anger are the oldest and so the most deep-rooted of the instincts.
In particular will he be transformed as the gland is affected which is the centre of the system to which the others adapt and accommodate themselves. The inertia of the system is very great, almost absolute, and always tends to return. If he has children, he hands on his constellation of endocrines, in spite of mishaps, not at all or only slightly transformed.
But a statement like the following of Cushing, the eminent surgeon-student of the endocrines, that "it is quite probable that the psychopathology of everyday life hinges largely upon the effect of ductless gland discharges upon the nervous system," shows which way the wind is blowing.
A type of pituitocentric has an almost uncontrollable craving for sweets. Alcohol and the endocrines remain to be studied. Light, heat and humidity stand in some special relation to the adrenals. Pigment deposit in the skin as protection against light is controlled by the adrenal cortex. The reaction of the skin blood vessels to heat and humidity is regulated by the adrenal medulla.
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