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Updated: June 20, 2025
Without the vegetative system, the great complex of viscera in the abdomen and chest, blood and its vessels, endocrines, muscles and nerves, the brain would remain but an intricate cold storage plant of memories, associations of past experiences. It would need no change and initiate no effort.
This action largely takes place in the speech muscles but also it irradiates into the rest of the organism. Especially is this true if the thought is associated with some emotion. Emotion, as we shall discuss it later, is at least in large part a bodily reaction, a disturbance in heart, lungs, abdominal organs, blood vessels, sympathetic nervous system, endocrines, etc.
As architects of human qualities the endocrines must be involved in the Mendelian unit factors. Moreover, they seem to act upon a particular locale in different degrees, which is the strongest argument against the resolution of a number of structural traits into Mendelian unit characters.
It may be another example of the curious coincidences that have been called the Fitness of the Environment that the investigation of the endocrines promises to put into our hands the instruments of the control of the future of the nervous system. In general, meanwhile, the eugenist should strive for raising the level of the endocrine potential, and discourage its lowering.
By their effects upon the endocrines, public health influences like food, clothing, sleep and overpressure and last but not least, disease, the so-called diseases of childhood, possess a tremendous importance in limiting the output of the educable. They act to subtract from and so to lower the rating, the capacity of the germ-plasm.
All necessary, not alone because if she had been meek and mild she would have existed in futility, but because of the high percentage of the masculine endocrines in her composition. It is most regrettable that we have no statement of the findings of a gynecologic examination of her.
Deterioration of mentality and character so often observed during the menopause, with its apathies or excitements, melancholia or mania, the fits of weeping or gaiety, the loss of grip upon reality, the complete change in mood and temperament that reflect the transformation of the organic outlook, demonstrate clearly the overwhelming influence of the endocrines upon the attitudes of the self toward the self.
As differentiation and bulk thus appear antagonistic, at least at the beginning of growth, the function of the thymus, at a maximum during infancy, seems then to be to restrain the differentiating endocrines, until sufficient material has been accumulated by the organism upon which the differentiating process may work. After the second year, the thymus begins to shrink.
But life episodes and crises, diseases, accidents, and struggles, experiences of pleasure and pain, as well as climatic factors, settle finally which endocrine or endocrines are left in control as a consequence of the series of reactions the period of maturity may be analyzed into.
A chink of light has been let in upon a dark cave, and slowly the chink will widen. But the gross effects are clear. Around the ovary and the uterus, the endocrines gyrate as the planets around the sun. The ovary is the organ for the preservation and maturation of the germ plasm, that treasure which the body is built but to cherish and hand on as a sacred heirloom.
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