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There was a fully developed oviduct on the left side, on the right another less than half the full length. There was also a vas deferens on each side. There was a gonad on each side, that of the right about one-fourth the size of that on the left. In microscopic structure the right gonad resembled a testis consisting entirely of tubuli lined by an epithelium consisting of a single layer of cells.
"Esto bonus miles, tutor bonus, arbiter idem Integer: ambiguae si quando citabere testis, Incertaeque rei, Phalaris licet imperet ut sis, Falsus, et admoto dictet perjuria tauro, Summum crede nefas animam praeferre pudori, Et propter vitam vivendi perdere causas ."
Internally there were two oviducts, that of the left side normally developed, that of the right diminutive and less than half the full length. The gonad of the left side had the tubular structure of a testis, but showed no signs of active spermatogenesis, but in its lower part contained two ova. Camb. Univ.
Smith and Schuster found that ovariotomy, with or without subsequent implantation of testes or injection of testis extract, had no effect in causing the thumb of the female to assume any male characters.
We see, therefore, how extremely important is the function of the testis. Its significance is not alone for the race, it is not simply concerned with the formation of the spermatozoa which share equally with the ova the honor of making the mankind of the future. It also has a separate and distinct function which has reference to the individual.
I found an oval body of dark, dull brown colour loose among the intestines: this was evidently the left testis which was separated from its natural attachment and lost in the abdomen at the time of the operation. I examined the natural sites of the testes: on the right side there was a small testis of considerable size, about half an inch in diameter.
The bladder and the internal organs of generation were those of a man in whom neither testis had descended into the scrotum, and in whom the uterus masculinus and vagina were developed to an unusual degree.
The effects were reported to the Society of Biology in Paris, one memorable evening, June 1, 1889, in two notes on the results of the hypodermic injection in man of the testis juice of monkeys and dogs, and certain generalizations deduced therefrom.
The fact that a hormone from the testis affects the development of the antler, as well as our knowledge of hormones in general, suggests a special theory of the heredity of somatic modifications due to external stimuli. Physiologists are apt to look for a particular gland to produce every internal secretion.
The movement of the testis can thus be accurately described as a transposition or dislocation. Various causes have been suggested for the formation of the scrotum, but no one has ever been able to suggest a use for it. It has always been quite impossible to bring it within the scope of the theory of natural selection.
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