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However, any technique that encourages a body to produce more of this hormone would be of great interest to life extensionists. The body only produces growth hormone at certain times and only when certain nutrients are present in the blood. Gerontologists call these nutrients "precursors." The precursors are two essential amino acids, argenine and ornithine and certain vitamins such as C and B6.
Considering that the testes throughout the winter months are crammed with spermatozoa, which must require some nourishment, and which may be giving off a hormone all the time, the argument has very little weight.
It would seem that the development of this character is dependent on the hormone from the mature testis, and in order to conform with the arguments used by me in other cases, the spinulation should have some definite function in relation to the habits of the sexes, and this function should involve some kind of external stimulation restricted to the mature male.
There are certain terms for the glands of internal secretion which are used interchangeably. They are spoken of often as the endocrine glands and as the hormone producing glands. Endocrine is most convenient for it stands for both the gland and its secretion. Hormone is employed a good deal in the literature of the subject.
Periodic examinations, to check up the balance sheets of the hormone factories and to measure the amount of their damage by means of blood analyses, will provide the most valuable method in the campaign to lengthen the productive and enjoying span of life. Endocrine hygiene will discover no wider or more fruitful area for exploration and control than that of crime.
The males have sexual instincts, themselves dependent on the testicular hormone, which develop sexual jealousy and rivalry, and the Ruminants fight by butting with their heads because they have no incisor teeth in the upper jaw, or tusks, which are used in fighting in other species.
Castration, then, tends to prove that in Birds the development of the male characters is not so closely dependent on the stimulation of testicular hormone as in Mammals. The characters must therefore be developed by heredity in the soma, which implies that the soma must itself be differentiated in the two sexes. The development must therefore be more in the nature of gametic coupling.
All we can suggest is that the hormone from the rapidly growing antler, including the covering skin, is acting on the corresponding factor in the gametocytes for a certain part of every year, and then, when the skin is stripped off, the hormone disappears. The factor then may be said to be stimulated for a time and then the stimulus suddenly ceases.
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