100 Blair Bell 



contents (niembrana granulosa) tend to disappear — the primordial ova 



Fig. 25a. — Section of the ovary of dog 3 before operation. (Photoraicrogra{)h x 40. 



Fig. 25b. — Section of the ovary of dog 3, 210 days after partial removal of 

 pars anterior. (Photomicrograph x 40.) 



become opaque and lose their chromatin fibres, the interstitial cells vanish, 

 and the stroma becomes fibrous. 



