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And since these endocrines control not only physique and physiognomy, anatomic and functional minutiae, but also mind and behaviour, we are justified in putting down the white man's predominance on the planet to a greater all-around concentration in his blood of the omnipotent hormones. While the Negro is relatively subadrenal, the Mongol is relatively subthyroid.
It varies with the water content of the body, the state of the vegetative nervous system, and the body temperature. Thus the skin of the hyperthyroid and the subadrenal is soft and moist, because of their antagonistic effects upon the sympathetic system. The subthyroid and the hyperadrenal have dry and harsh skins for the same reason, if no other glands intervene.
When the skin, especially the skin over the shoulders, the breasts and the abdomen, is stroked with some blunt object, the blood vessels react either by a greater filling up or emptying of themselves. The latter occurs most regularly in the subadrenal types, the former in the hyperthyroid. Both forms of reaction run parallel to the different check or drive effects of the vegetative apparatus.
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