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All learning which calls out or arrests the functioning of an instinct, must, from what we have learned of the chemical dynamics of instincts as reactions between hormones, nerves and viscera, affect the vegetative system.
The factor in the gametocytes then in each generation acted upon by both hormones, and we must suppose that in some way the result was produced that the hereditary development of the antler in the soma only took place when the testicular hormone was present.
The difficulty of this theory is one which has occurred to biologists who have previously made suggestions of a connexion between hormones and heredity namely, how hormones or waste products from one part of the body could differ from these from the same tissue in another part of the body.
What's wrong with repetitive adrenal whipping is that adrenal fortitude is variable; many people's adrenals eventually fail to respond to the prod of salt and the body begins to suffer from a lack of adrenal hormones. Often those inheriting weak adrenals manifest semi-failure in childhood. The consequence is that ordinary, irritating substances begin causing severe irritation.
They are called endocrine glands or organs, and their chemical contributions to the blood are known as hormones. Sometimes those which do nothing but furnish these secretions are spoken of as "ductless glands," from their structure. Some authorities think that "every cell in the body is an organ of internal secretion", and that thus each influences all the others.
But the chemists would have none of this, and denied that the colloids, about which they ought to know more than do the biologists, had that promise in them which had been claimed. We had Leduc and his "fairy flowers," as now we have Loeb and others with their metabolites and hormones.
In view of all the possible mixtures, permutations and combinations of the endocrine glands, that may construct an individual, it is possible to conceive a million types of normals. For normality means harmony, the harmonious equilibrium between the hormones, which tends to continue itself, because it does no harm to itself.
The evidence, as we have seen, proves that, at any rate in the large number of cases where this relation between somatic sex-characters and hormones produced by the reproductive organs exists, the characters are inherited by both sexes. In one sex they are fully developed, in the other rudimentary or wanting.
Nowadays, we see its domain as a limited monarchy, if not indeed as one sovereign state of a republic, a member equal but not superior to the others of a board of directors. Its true business comes down to two particular rôles: first, the production of ova, and, second, the secretion of a hormone or hormones. Over the other functions once supposed its monopoly, all the ductless glands rule.
And since these endocrines control not only physique and physiognomy, anatomic and functional minutiae, but also mind and behaviour, we are justified in putting down the white man's predominance on the planet to a greater all-around concentration in his blood of the omnipotent hormones. While the Negro is relatively subadrenal, the Mongol is relatively subthyroid.
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