CHANGES IN THE OVARY 



157 



and certain other writers, whose results are for the most part in 

 general agreement. 



Schulin, and also Janosik, appear to regard the follicular 

 epithelial cells as being converted into leucocytes, which they 

 undoubtedly resemble when undergoing degeneration. Flemming, 

 on the other hand, denies the existence of leucocytes, pointing out 





-I^M^Ss "^^8^ 



FIG. 39. Section through follicle in late stage of degeneration. (From 

 Sellheim.) The cavity is in process of being filled by an ingrowth of 

 tissue from the wall. The ovum has disappeared. 



that none exist in the theca, and Schottlander clearly distin- 

 tinguishes degenerating epithelial cells from leucocytes. 



More recently, however, Dubuisson l has stated that in the 

 sparrow the follicle cells may multiply and act as phagocytes to 

 the yolk of the degenerating ovum, which becomes filled with 

 them. Afterwards they are said to migrate, leaving nothing 

 but connective tissue which fills in the cavity of the follicle. A 



1 Dubuisson, "Contribution k I'fitude du Vitellus," Arch, dc Zool. i'xper., 

 vol. v., 5th series, 1906. 



