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That the response in a place like the Solfatara is what we have seen it to be, is the result of an extraordinary lability of the equilibrium between gravity and levity, a characteristic appertaining to the earth's volcanism in general.
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. The lability the post-pituitary confers upon the combinations of perceptions and conceptions, grouped as the imagined, extends to the ruling mood that may be spoken of as the organic outlook.
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.
A state of lability of cells at a point because of increased or decreased use. An increased or decreased appropriation by them of the hormone controlling their function. A corresponding increase or decrease in function of the gland of internal secretion and so, An increased or decreased representation of it in the reproductive sex cells in the gonads.
For the people living near the Solfatara it is indeed common knowledge that there are times when this lability is so great that the slightest local disturbance of the kind we have described can provoke destructive eruptions of great masses of subterranean mud.
That some poison, probably an oversecretion of the thymus, is responsible is shown by the relief obtainable by X-ray shrinkage of the gland, or the surgical removal of a part of it. Moreover, the gland is influenced by and influences the factors of body weight and growth with an extreme readiness and lability. Deficient general undernutrition leads to rapid decline in its weight.
This repressive function is probably not worked from special nervous centers, nor can we speak with confidence of collisions with "sums of arrest" in a sense analogous to that of Herbart, or of stimuli that normally cause catabolic molecular processes in the cell, being mysteriously diverted to produce increased instability or anabolic lability in the sense of Wundt's Mechanik der Nerven.
Even before puberty, cyclic variations of health and conduct may be observed in boys and girls which undoubtedly depend upon currents among the internal secretions. Children, who, in the best of circumstances, habitually are attacked by a wanderlust and run away from home, or suffer from fits of naughtiness, are samples of such endocrine lability.
"While these faint tendencies often crop out in a behavioristic way, by far the most of them need some stimulus of individual experiences to awaken them, and still more exist only in the slight facilitization of impulses or permeability of nervous centres, lability of molecular or neural tensions, or as preferential re-enforcements, in one rather than in another direction or manner."
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