664 DEVELOPMENT OF THE KIDNEYS, ETC. 



layer is to be seen the germinative vesicle, with the germinative 

 spot, surrounded by a faintly granular vitellus, more or less 

 abundant in different parts. Some of the Graafian follicles con- 

 taining eggs are as large as 4^ of an inch; others as small as 7^55. 

 In the very smallest, the cells of the membrana granulosa appear 

 to fill entirely the cavity of the follicle, and no vitellus or germina- 

 tive vesicle is to be seen. 



