CHANGES IN THE OVARY 



"S 



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 





IL , 



Fig. 28. — Various stages in the development of the Graafian follicle of the 

 rabbit. (From Schafer.) 



A, From young rabbit, showing Piiuger's egg-tubes ; B, C, D, E, successive 



later stages. 



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

 pabulum for the developing oocyte. 



The changes involved in the production of ova have been fully 

 investigated by von Winiwarter ^ in the rabbit. These changes 



1 Von Winiwarter, "Eecherches sur I'Ovogenfese de TOrganogenfese de 

 I'Ovaire des Mammifbres," Arch, de BwL, vol. xvii., 1900. 



