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"The term varices," he says, "is applied to dilated veins, which occur sometimes in connection with the testes and sometimes in the limbs. Operations on testicular varices patients do not readily consent to; those on the limbs may be cured in several ways.
Some of these were quite nearly males in appearance and behaviour, though they laid eggs. Testicular and ovarian extracts were injected. The more feminine birds were often killed by the testicular extract, the more masculine by the ovarian extract. Finally, to make assurance doubly sure, some females which should theoretically have been the most feminine were dissected and shown to be so.
Seasons of intense and prolonged sexual excitement are in a high degree inimical to continence, and even though the subject does not fully submit to his inclination, his nocturnal emissions, which are likely to come frequently, carry away the product of the testicular secretion, thereby depleting to a certain extent, his virility.
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.
There is, however, another use which is subserved by the testicular products, a use which may indeed be said to be implied in those uses to which reference has already been made, but is yet historically the latest to be realized and studied.
Careful aseptic precautions must be observed in operating on colts, as they are very susceptible to wound infection and peritonitis. The blood-vessels of the testicular cord are larger in the adult animals, and the danger from haemorrhage is greater than in the young. For this reason, it is advisable to use an emasculator in castrating all mature animals. Complications Following Castration.
While the spermatozoa are formed in the glandular tissue of the testes, the seminal fluid as finally emitted in detumescence is not a purely testicular product, but is formed by mixture with the fluids poured out at or before detumescence by various glands which open into the urethra, and notably the prostate.
It is stated that all human brains of unusual power are brains that are well-nourished by the testicular secretions, and it is implied, with full understanding of what this statement leads to, that if, for any reason, there is an interference with this sex-gland activity, the unusual brain will cease in a short time to be unusual in its power, grasp, and faculty of clear, continuous thought.
Many physiologists in recent years have maintained that the testicular hormone is not derived from the male germ-cells or spermatocytes, but from certain cells between the spermatic tubuli which are known as interstitial cells, or collectively as the interstitial gland. They state that the interstitial cells appear in the male embryo before the gametocytes present distinctive sex-characters.
If the period of sexual excitement extends over fifteen to thirty minutes, the whole duct system from the epididymis to the ampulla becomes gorged with the secreted testicular product. This secretion consists of active motile spermatozoa, of spermatic granules and of mucus.
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