. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Developing Vesicles of the Spermatozoa from the Testicles of the Dog. siderable number of them in one common cyst is unusual; but they may, according to Kol- liffer's statement, amount to twenty. The size of the cyst naturally depends on the number and state of developement of the vesicles it encloses. Ordinarily it amounts to about 1 /// _!_"' TotJ TfcT • On pursuing the genesis of the vesicles of developement, it will be found that they are produced in the interior of cells, according to the law of endogenous form
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Developing Vesicles of the Spermatozoa from the Testicles of the Dog. siderable number of them in one common cyst is unusual; but they may, according to Kol- liffer's statement, amount to twenty. The size of the cyst naturally depends on the number and state of developement of the vesicles it encloses. Ordinarily it amounts to about 1 /// _!_"' TotJ TfcT • On pursuing the genesis of the vesicles of developement, it will be found that they are produced in the interior of cells, according to the law of endogenous formation. The various circumstances which present themselves during the microscopical analysis support the proba- bility of this opinion. It is certainly often difficult to determine whether an individual vesicle is destined for the production of other cells (tochter-Zellen), or immediately for the formation of a spermatozoon. But we shall see presently that the daughter cells are fur- nished with the same capacities as the free vesicles of developement; they are like them in every respect, and justify the inference of a perfect identity with them. Wherever, there- fore, we find these free vesicles of developement, they have, in our opinion, likewise been pro- duced in the interior of other cellular forma- tions, and have only become free by the dis- solution of the former. The real process of formation of the spermatozoa in the interior of the vesicles of developement cannot be reached by our observation. The spermatozoon does not possess at its commencement those sharp, distinct contours—that great refracting power, which afterwards so much distinguish it. Like a slight linear shadow it is seen lying in the in- terior (Jig. 327. A, B) ; in addition to which it Fig. Spermatozoa of the Doy in the interior of the developing Cell. is covered by the granules, which are so readily deposited from the liquid part of the con- tents. It is only gradually that it assumes a disti
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