germ-cells or oogonia give rise, after a series of two or more divisions, 

 to ova, follicle-cells, and interstitial cells. The two latter types of 



FK;. 28. Various stages in the development of the (iiaafian follicle of the 

 rabbit. (From Sehafer.) 



A, From young rabbit, showing Pfliiger's egg-tubes ; !'..(. I >. I-'., Mir.-rssive 



later stages. 



cell may remain for a time as reserve cells or may lie absorbed as 

 pabulum for the developing cocyte. 



The changes involved in the production of ova have been fully 

 investigated by von Winiwarter l in the rabbit. These changes 



1 Von Winiwarter, "Becherches sur 1'Ovogenbse de 1'Organogenese de 

 1'Ovaire des Manimiferes," Ar<-ft. de ///<//., vol. xvii., 1900. 



