184 



OVARY AND PAROVARIUM, BY W. WALDEYER. 



spheroids, the mass of which is cloudy from the presence of 

 fine molecules ; how these originate, however, has not hitherto 

 been investigated. 



From whence then, in the last place, proceeds this originally 

 finely granular secondary vitelline mass ? It is incontestably a 

 product of the follicular epithelium, and, in fact, results directly 

 from a metamorphosis of the follicular epithelial cells. On this 

 point I differ from Gegenbaur, with whose views I am otherwise 

 for the most part in accordance ; for Gegenbaur (45) has very 

 recently advanced again his earlier view, to the effect that the 



Fig. 194. 



f- 



Fig. 194 (corresponding to No. 25, PI. iii., of my book). Section 

 of the wall of the follicle of a Fowl that had a diameter of four milli- 

 meters. (Hartnack 3-7.) a, Yolk spheroids ; a' molecular vitelline 

 layer ; 6, zona radiata ; c, follicular epithelium ; d, epithelial cells 

 with fine cilia at the basal extremity ; e, membrana propria folliculi ; 

 /, internal layer of the connective-tissue wall of the follicle, with 

 numerous cells ; g, external layer ; h, epithelium of the ovary. 



constituents of the vitellus only result from the differentiatioi 

 of the protoplasm of the primitive cells of the ovum. In youi 

 ova, indeed, no difference can be perceived between the prol 

 plasm of the epithelial cells and the finely granular seconds 

 yolk ; it appears as if the protoplasm itself issued forth froi 

 the internal membraneless extremity of the cells, and was coi 

 tinuous with the secondary yolk mass ; whilst at the nucle 



