CHANGES IN THE NON-PREGNANT UTERUS 109 



from the edges of the adjoining epitheUuiu wliich had not 

 suffered destruction. In tliis way the I'e-forraation of tlie 

 epithehuni is sufficiently accounted for, since, as already re- 

 marked, only a very inconsiderable number of cells is removed 

 during the sheep's prooestrum. 



Congestion of the stroma gradually diminishes, and the 



Fig. 18. — Section through portion ot uterine mucosa of sheep showing 

 black pigment {pig.] formed from extravasated liluod. 



mucosa as a whole undergoes a shght shrinlcage. It would 

 appear that a few new capillaries are formed, Init there is no 

 evidence that any of the extravasated corpuscles are gathered 

 up afresh into the circulatory system. On the other hand, 

 there are ample indications that all those corpuscles which 

 remain in the tissue become transformed into pigment, as 

 originally concluded by Bonnet.^ According to this investigator, 

 the extravasation takes place in the deeper mucosa, and the 



^ Bonnet, " Uebcr Melanose der Uterinschleimhaut," &c., Deutehe Zcitsch. 

 f. Thici'mcdizln, vol. v., 1880, and vol. vii., 1882. " Beitriigc zum Eudjrj-ologie 

 der Wiederkauer," &c., Arch. f. Anat. u. Phijs.. Anat. Abth., 1884. 



