Facing page 22. 



Fig. 1. 



The ripening of the Graafian follicle, x 300. 



The follicle is near the surface of the ovary. The'ovum is situated in the 

 centre and surrounded by the cells of the membrana granulosa. The formation 

 of liquor folliculi is seen proceeding among the cells of the membrana granulosa 

 in various places. Eventually these collections of fluid merge together, leaving 

 the ovum attached by a small mass of membrana cells (discus proligerus) to 

 one part of the wall of the follicle. 



