152 THE PHYSIOLOGY OF REPRODUCTION 



Kolliker/ van der Stricht,^ Seitz,^ Loeb, and certain other writers, 

 whose results are for the most part in general agreement. The 

 degenerate follicle in the cow has been described by Delestre.* 



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 that none exist 

 in the theca, and Schottlander clearly distinguishes degenerating 

 epithelial cells from leucocytes. 



Fio. 45. — Section through follicle iii 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. 



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

 sparrow the follicle-cells may multiply and act as phagocytes to 



^ KoUiker, "Uber Corpora Lutea Atretica bei Saugethieren," VerJiand. d. 

 Anat. Oesell., in Kiel, 1898. 



^ Van der Stricht, "L'Atr6sie Ovulaire, etc.," Verhand. d. Anat. Oesell., in 

 Bonn, 1901. 



' Seitz, "Die FoUikelatresie wahrend der Schwangerschaft, etc.," xirch. f. 



lak., vol. Ixxvii., 1906. 



* Delestre, loc. cit. See also Athias, "Les ph6nom'Snes de division de 

 I'ovule, etc.," Anat. Am., vol. xxxiv., 1909 ; and Asimi, " Observations on 

 Follicular Atresia, etc^," Anat. Record^, vol. xviii., 1920. 



s Dubuisson, "Contribution a I'Etude du Vitellus," Arch, de Zool. Exper., 

 vol. v., 5th series, 1906. 



