Francis Galton, pioneer student of the conditionings of human faculty, left an interesting study of the visualising capacity, so far as it could be attacked by the statistical method. Two of his conclusions are worth repeating for our purposes. One is that the power to imagine is poor in philosophers and men of science. The other that it is higher in the female sex than in the male. We have seen that the philosophic, scientific, intellectual mind, the capacity to abstract, and think in terms of abstractions, is definitely dependent upon proper secretion by the ante-pituitary. In woman, the post-pituitary is generally predominant over the ante-pituitary. Though we are in need of a series of studies of the endocrine traits and composition of men endowed with high imaginative qualities, and so are at a loss, we have indications of an endocrine control of the state of consciousness we speak of as the imaginative. Most of the evidence accumulated in the examination and treatment of morbid conditions characterized by a restless, incoordinate activity of the brain cells points to excess of the post-pituitary secretion as the cause, or as one of the most important causes. The thyroid and the adrenal medulla also exert their influence. But the strongest appears to be the post-pituitary. Phobias, fears which obsess the mind, anxiety neuroses, suspicions, hallucinations, delusions, nervousness, all expressions of what we may sum up technically as the imaginative state of mind, occur and occur frequently, associated with other symptoms of posterior pituitary overactivity. Persons in whose make-up it rules are more liable to imagine disturbances of their mentality, or exhibit a well-developed imaginative streak. Normal states of overactivity of the post-pituitary such as occur in some women during the menstrual period and pregnancy, and in some men as part of the endocrine cycle of their everyday lives, are accompanied by increase in the susceptibility and vigor of the imagination. Whether the feeding of excess post-pituitary would lead to a stimulation of the tendency or ability to imagine is still to be decided. But it is known that quieting the post-pituitary by various means will cause a depression of the faculty, and eliminate its pathologic manifestations. Psychologists distinguish between the constructive imagination that expresses itself in an ordered activity and the unbalanced fancies of the fearful neurotic for example. The post-pituitary confers the lability of the underlying state of brain in all of these imaginative tincturings of consciousness. The constructive imagination, one of the few truly precious gifts of a personality, is probably the expression of a certain balanced activity of the ante-pituitary and the post-pituitary. MOODS AND THE ORGANIC OUTLOOK