HISTOLOGY. 117 



covered with two capsules : the germ epithelial layer of 

 cells, derived from the peritoneum and a tough band 

 of fibrous tissue, called tunica albuginea. The sub- 

 stance of the ovary is divided into two parts, the corti- 

 cal and medulla, which merge into each other. In the 

 young ovary one of the cells of the germ epithelial 

 layer becomes cut off and drops down into the medulla. 



L. S. OVARY. CAT. 



1, germinal epithelium; 2, immature Graafian follicles; 

 S, stroma; 4, blood vessels in stroma; 5, a Graafian follicle 

 from which the ovum has escaped; 6, 7, ova in different 

 stages of development; 8, a fully developed ovum; 9, cor- 

 pus -luteum. 



