Intellectually, these people vary enormously, depending upon which of the other glands will enlarge to compensate for the deficiency of the thyroid. If the growth of the skull has left a roomy sella turcica for the pituitary to grow in, the intellect may be normal or even superior, though energy is below par. If this is not possible and the adrenals have to predominate, a lower, more animal and less self-controlled type of mentality is produced. In direct contrast to the subthyroid types is he who originally was hyperthyroid. During childhood he is quite healthy, thin, but striking robust, active, energetic, generally fair-complexioned with nose straight and high bridged, eyes rather "poppy," teeth excellent, regular, firm, white with a pearly translucent enamel. These children are always on the go, never get tired, require little sleep. Seldom will one of the classical children's diseases strike them, measles perhaps, but no other. Adolescence for them, however, is more apt to be stormy and episodic, adjustment to the new world of people and things is much more difficult, wanderlust is acute. All an expression of cells keyed up, charged with energy that must flow somewhere or explode. The ruddy live-wire, recognized everywhere as bubbling with vitality, the life of any group, the magnetic personality may, however, be shocked by some seismic event like the death of a father or mother, or the ruin of some cherished ambition. A break in the balance of the other glands follows quickly and disablement and invalidism, which may cure itself after some years, remain stationary, or descend to the worst forms of thyroid deficiency. During maturity, the type are characterized usually by a lean body, or tendency rapidly to become thin under stress. They have clean cut features and thick hair, often wavy or curly, thick long eyebrows, large, frank, brilliant, keen eyes, regular and well developed teeth and mouth. Sexually they are well differentiated and susceptible. Noticeable emotivity, a rapidity of perception and volition, impulsiveness, and a tendency to explosive crises of expression are the distinctive psychic traits. A restless, inexhaustible energy makes them perpetual doers and workers, who get up early in the morning, flit about all day, retire late, and frequently suffer from insomnia, planning in bed what they are to do next day. Certain types of thyroid excess associated with the thymus dominant next to be described are peculiarly susceptible to emotional instability. They are subject to brain storms, outbreaks of furious rage, sometimes associated with a state of semi-consciousness. To emphasize the analogy to epilepsy, their attacks have been called psycholepsy. Among the Italians especially they were watched and reported during the War, when the explosive fits were seen to take the form of irresponsible acts of insubordination or violence. THE THYMO-CENTRIC PERSONALITIES