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The chemical mechanism of the instincts described: sex libido, passion and jealousy in relation to the ovaries and testes, fear and anger in relation to the adrenals, sympathy and curiosity in relation to the pituitaries, suggests that a similar explanation will hold for the dynamics of the other instincts.
It must however be noted that the Sacculina itself is hermaphrodite, with ovaries much larger than the testes.
He claims by transplantation of the gonads in young rats and guinea-pigs to have feminised males and masculised females. The females are smaller, and hare finer, softer hair than the males. The testes were removed and ovaries implanted in young males. The animals so treated grew less than the merely castrated specimens, and therefore when full-grown resembled females in size.
He assured the author that at the time of his marriage his testicles were, as far as he had known, similar to the testicles of other young men, and that during his married life he had never had intercourse with his wife more frequently than once in a month, but that during that time he had noticed a gradual atrophy of the testes.
If the testes were developed from the beginning in a different part of the abdomen, there might be some reason in calling the change a mutation. Moreover, if it is a mutation, why has it never occurred in any other class of Vertebrates except Mammals? In 1903 Dr. Zool. Dr. Woodland correlated the dislocation of the testes with the special mechanical features of the mode of locomotion in Mammalia.
In these as in other respects the ovaries are precisely analogous to the testes. They not only form the ova, but they elaborate for internal use a secretion which develops and maintains the special physical and mental qualities of womanhood, as the testicular secretion those of manhood.
Thus far I spoke in colons; and afterwards by commas; and then returned to the colon, in "Testes dare volumus," "We are willing to produce our witnesses." This was succeeded by the following period, consisting of two colons, which is the shortest that can be formed, "Quem, quaeso, nostrum sesellit ita vos esse facturos?"
In this connection it is important to note that the development of the testes produces a profound effect upon both the physical and mental characteristics of the young man. This effect is produced through a substance formed in the testes and reabsorbed into the body, thus gaining access to the blood where it exerts its mysterious but profound influence.
The author has known one case of a young man who, for several years, practiced masturbation several times a day, so far depleting his powers that he could not walk erect, his muscles were flabby, his testes were very soft and small, his eyes shifty, his hands clammy and his mind incoherent in its working.
The proverbs and stories of all nations are full of references to them. But up to the nineteenth century no controlled experimental work was ever carried out regarding them. It was in 1849, that A.A. Berthold of Göttingen, a quiet, sedate lecturer, carried out the pioneer experiment of removing the testes of four roosters and transplanting them under the skin.
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