INTERNAL SFXRETIOXS 



107 



the corviral ranal of the uterus and lias a direft stimulating 

 effect on the mucosa, |)roducing a condition of pseudo-])regnancy, 

 and the corpus luteum itself persists for a longer jx^riod. The 

 same result can be brought about in the absence of the male by 



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I 



Fig. 72. — Experimentally ptoau'-ffi puu (;jita of p.soudo-pregnant rabbit ; 

 section of uterus showing connective tissue forming decidual cells 

 which enclose vessels. (From Hammond.) 



mechanical stimulation of the tissues at the anterior end of the 

 cervix by a tube or glass rod. Further, if during pseudo- 

 pregnancy the uterine mucosa were subjected to irritation in- 

 duced by injury or by the introduction of fine threads into the 

 uterine cavity, deciduomata were formed in just the same kind 

 of way as with the guinea-pig or the rabbit. It is believed, 



