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Updated: June 12, 2025
The unconscious vegetative system and the system of consciousness are both modified by the weakness of a link in the glandular chain. What, therefore, is to be recommended in the prophylaxis of the natural deterioration of the wells of life, the ductless glands? For even if we may be able to replenish them when they dry up, would it not be better to delay their dessication?
They may indeed be watched as an index scale or barometer of the general tone of the whole internal secretion system. Sex variations offer a variety of clues to variations, disturbances, predominances and abnormalities in all the components of the ductless gland association. To take a single instance, the development of the long bones is dependent upon the handling of food lime by the body.
The activity of sex is an activity that on the physical side is generated by the complex mechanism of the ductless glands and displayed in the whole organism, physical and psychic, of the individual, who cannot abolish that activity, although to some extent able to regulate the forms in which it is manifested, so that purity cannot be the abolition or even the indefinite suspension of sexual manifestations; it must be the wise and beautiful control of them.
Like the thymus it is a ductless gland, abundantly supplied with blood-vessels, and possesses a vast number of small cavities, lined with cells and containing an insoluble jelly. So far as appears, both these glands are useless, or nearly so, to man; or if the thyroid performs any useful service it is a minor and obscure one.
This is of course in the gaseous form, being known as water vapor. *Ductless Glands and Internal Secretion.*—Midway in function between the glands that secrete useful liquids and those that remove waste materials from the blood is a class of bodies, found at various places, known as the ductless glands.
It is the rearrangement of relationships among the ductless glands, the shifting of influences from the predominant to the subordinate, and vice versa, in the constellation of the internal secretions, that determines the unfolding of the personality. The transformations raise doubt sometimes as to the reality of personal identity.
These ductless glands, as we know, liberate into the blood what are termed "hormones," or chemical messengers, which have a complex but precise action in exciting and developing all those physical and psychic activities which make up a full life alike on the general side and the reproductive side, so that their balanced functions are essential to wholesome and complete existence.
II, pp. 561-2. Morgan, T.H. Heredity and Sex. N.Y., 1913, pp. 155f. Lillie, F.R. Theory of the Free Martin. Science, n.s., Vol. XLIII, pp. 611-13. Neugebauer, F.L. Hermaphrodismus, Leipzig, 1908. Vincent, S. Internal Secretions and the Ductless Glands. London, 1912, p. 69. Marshall, F.H. Physiology of Reproduction. London, 1910, p. 314.
The former concludes from certain experiments that a given organ of internal secretion has a certain function. The corpora lutea, for example, according to one theory are ductless glands, the function of whose secretion is to establish ova in the uterus and promote their development. Another function suggested for the secretion of the corpora lutea is to prevent further ovulation during pregnancy.
And as elastic tissue and internal secretions stand in the relation of created and creators, or at least preserved and preservers, a man may be said to be as old, that is as young, fresh and active as his ductless glands. There is no characteristic of the human body, except perhaps the teeth, more influenced in its quality, texture, amount and distribution than the hair.
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