56 



INTERNAL SECRETIONS OF THE OVARY 



ten hours after copulation. The subsequent development of the 

 corpora lutea is continued for some fourteen days in the non- 

 pi egnant animal. 



Fig. 29. — Photograph of .Mammary Gland of Rabbit in 



FIRST QiSTRUS. 



The ducts have developed out radially from the nipple. 



The uterine cycle consists of growth and vascularization at the 

 beginning of the breeding season, and, following ovulation, in 

 certain pregnancy or psuedo-pregnancy changes. During 

 oestrus the uterine stroma, though hypersemic, is not highly 

 glandular and the epithelium is straight and continuous. After 

 ovulation, under the influence of the corpus luteum, immense 

 growth takes place in the glands, which supply a secretion 

 responsible for the initial nutrition of the embryos. During 



