CHANGES IN THE NON-PREGNANT UTERUS 105 



into the lymphatics, and so re-enter the circulation. Pigment 

 formation has not been observed in the ferret. 



At a late stage in recuperation the stroma tissue tends to 

 become denser, and also to increase in thickness (ferret), until 

 the whole uterus once more acquires its normal condition. 



If copulation has taken place, spermatozoa in great numbers 



!-, si i, SM^ 

 L - * : S ?,4i3fc 



_ Ov 



M.v. 



FIG. 16. Section through mucosa of dog during a late stage of recupera- 

 tion. (From Marshall and Jolly.) 

 U. i 1 ., blood-vessel; up., spermatozoa in cavity of gland. 



may be observed in the deeper portions of the uterine glands, 

 as well as along the edges of the uterine cavity. 



THE CYCLE IN RODENTS 



Comparatively little attention has been paid to the uterine 

 changes in Rodents. In the rabbit it has been noticed 

 that the uterus is swollen and congested during " heat," 

 and the same observation has been made in the marmot 



