156 INTERNAL SECRETIONS OF THE OVARY 



animal upon the presence of follicles, it was originally thought 

 that injection of an animal sterilized by exposure to X-rays 





Fig. 54. — Atretic Corpus Luteum in untreated Mouse. 



{cf. fig. 52 ). 





Fig. 55. — Ovary of Mouse injected with Sodium Hydroxide 

 extract of anterior Pituitary at three weeks old. 

 C.I. a. corpus luteum atreticum; 0. remains of ovum. 



would not cause the typical inhibition of oestrus, in other words, 

 would not produce luteinization of the ovary. This expectation, 



