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They may indeed be watched as an index scale or barometer of the general tone of the whole internal secretion system. Sex variations offer a variety of clues to variations, disturbances, predominances and abnormalities in all the components of the ductless gland association. To take a single instance, the development of the long bones is dependent upon the handling of food lime by the body.
For he realized, though he sometimes credited it to his clinical intuition, that it was a certain type of personality that was liable to the specific disease. But personality and its reactions, normal and abnormal, are determined by the endocrines. So we should find that particular infections run with special internal glandular predominances.
There is no better way of illustrating the influence of the internal secretions upon the normal than the analysis of the variation of traits with variations in glandular predominances.
Beside, there is the prophylaxis of bacterial infections, and their all embracing corrosions which, too, have an endocrine aspect. Persistence of youth or juvenility may be manufactured by nature in two ways. There may be a persistence of early glandular predominances. We have seen what happens to the thymocentric. That a pineal-centered juvenile or infantile type exists may be safely predicted.
The masculinoid woman, as a functional hermaphrodite, exists first as a congenital entity, with an inborn distribution of endocrine predominances that make for masculinity. There are also numerous acquired forms. The infections of childhood, measles, scarlet fever, diphtheria, and above all mumps, may so damage the hormone system that an inversion of sex type follows.
It has been observed that financiers of mark, like great musicians, are special pituitary types. Also that the financiers are voracious meat eaters and the musicians inordinately fond of sweets. Differences in anterior and posterior predominances might account for this.
Suppose that some enduring intelligence watched through the ages the successions of life upon this planet, marked the spreading first of this species and then that, the conflicts, the adaptations, the predominances, the dyings away, and conceive how it would have witnessed this strange dramatic emergence of a rare great ape to manhood.
The study of matings, the heart of the matter, will concern itself with the investigation and comparison of the kind of endocrine personalities that mate, the internal secretion predominances that cross, and the consequent endocrine personality of the offspring.
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