Certain of them, after a stormy life in the twenties, become adapted to their surroundings in the thirties because the pituitary gradually emerges and becomes dominant in their personalities. They are then recessive thymocentrics. An increase in size, a broadening, together with a greater mental tranquillity and stability, accompany the adaptation. Historically, the thymocentrics who combined brilliancy and instability played a great part as some of the famous adventurers and restless experimentalists. THE SEX GLAND CENTERED OR GONADO-CENTRIC PERSONALITIES (The Eunuchoid Personality) Among the individuals whose personality is dominated by their sex glands the physiognomy, physique and life reactions are so distinctive that no better examples exist of our main thesis: that the whole life of man is controlled primarily by his internal secretions. These gonado-centric types are not all necessarily sex gland deficient, as the term eunuchoid implies. They may be rather gonad unstable with a corresponding instability of the entire endocrine system. About the face of the eunuchoid the striking feature is the incomplete, irregular, or absent hair development. Below thirty it is chubby and ruddy, and rather childish in its texture; after thirty, there is an effect of premature senility: the skin is yellowish, leathery, and wrinkled as the faces of old women are wrinkled: the upper lip is traversed by vertical wrinkles, and wrinkles come around corners of the mouth. The expression is juvenile, effeminate or plaintive. Invariably the voice is higher pitched than the usual masculine tones. It may be gentle and subdued, like a genteel female's, or strident and rasping. Occasionally it is a pleasant high tenor. The Adam's apple, poetic popular name for the thyroid cartilage, is never prominent, because it is not ossified, as it should be in the normal male. Tall and slender, or generally undersized, the muscles are soft and flabby as a woman's. The hands and feet are small and gracile typically. Viewed in profile, the lines of the body are feminine. The breasts may reach almost the size of the female's and there may be a well-marked area of pigmentation around the nipple. The hair growth under the shoulders and on the lower abdomen tends to be scanty and to approximate the opposite sex in quality and distribution, as do the reproductive organs themselves.