ORGANS OF INTERNAL SECRETION 325 



in which two rats from the same litter were known to have been 

 employed, so that the ovaries were grafted into whole sisters, 

 but we were not sure of the relationship in every case. 



** r .;.\. 



" ', -'~t- 



f; .; ... ,*' :-: 



: %^im 





3'/,--;'^ - -^ATo^- 



FIG. 73. Transverse section through uterus of rat after ovarian trans- 

 plantation. The uterus is normal. (See text and cf. Figs. 71 and 72. 

 From Marshall and Jolly.) 



These experiments clearly indicate that the nature of the 

 ovarian influence is chemical rather than nervous, since the suc- 

 cessfully grafted ovaries, while still maintaining their functions, 



