INTERNAL SECRETIONS 



lO- 



not ovulate except after copulation it follows that under normal 

 conditions cor])ora lutea are associated with ])refjnancy, and that 



Fig. 69. — Section through uterine njucosa of rabbit twenty-four days 

 after sterile coition (retrogressive stage in pseudo-pregnancy). A 

 great quantity of extravasated blood is seen. The glands are still 

 somewhat enlarged. (From Hannnond and Marshall.) 



the so-called " corpus luteum spurium " (which in other animals 

 is formed after a spontaneous ovulation) does not exist. If, how- 

 ever, a doe rabbit is induced to ovulate under such experimental 

 conditions that gestation cannot supervene, the development 



