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Mental measurements of any large group of population reveal a remarkable percentage of it as below the mental age of 12. Juvenile traits and juvenile mind, separate or combined, should always suggest the possibility of the infantiloid constitution of one type of thymocentric also. The eunuchoid or feminoid personality is also found often among artists.
That is to say, officially its involution begins. Careful dissection will demonstrate some thymus tissue even in a normal subject up to the fourteenth year. This refers to the average normal, for the large thymus may continue large and grow larger after the second year in the type of individual designated in a preceding chapter as the thymocentric.
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 points of immediate interest are the height, the complexion and the beardlessness. One classic variety of the thymocentric is tall, has a baby's skin, and has little or no hair on the face. A passage from a narrative written by one of his warders confirms the last condition decidedly.
The daughters of mothers who menstruated early, themselves menstruate early. Animals fed upon thyroid during pregnancy, comparable to the thyrocentric, give birth to offspring with a very large thymus, comparable to the thymocentric. Women with partial thyroid deficiency, or myxedema, bear cretins.
The types of personality sketched the thyrocentric, the pituitocentric, the adrenocentric, the thymocentric, the gonadocentric are really prototypes, the great kingdoms of personality, to which individuals can be assigned, by hall marks which facilitate their classification. They may also be described as the pure endocrine types, which include a minority of a population.
A recent study of twenty murderers in the State of West Virginia showed them all to have a persistent thymus and the thymocentric constitution. A study of the recidivists, those who return for second and third offences, in one institution, disclosed that a large majority had a subnormal temperature and an increased heart and breathing rate. These are endocrine-controlled functions.
Any type of endocrine inferiority, interfering with success in life, may lead to the habit of drug addiction as one way out. But the blood and tissues of the thymocentric appear to become habituated to the narcotic stimulant more easily than the other types, and so to demand it with a physical imperative comparable to the food or sex urge.
"Before leaving his cell to see a visitor, he was alway careful to conceal, as far as possible, his unshaven chin by means of his red handkerchief." Bristles on the chin, with little or none on the cheeks, is the inference. It is important to stress the thymocentric significance of this glabrosity of the face. Another sign to be put in italics was the quality of his voice.
Thyroid poverty is a splendid enticement to the universal microbe. The thymocentric stands all diseases poorly. The pituitary type is more liable to epidemic meningitis and infantile paralysis, typhoid and scarlet fever. The public health officer of the future will be armed with a new weapon in his fight against the spread of an epidemic.
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