I'LATl-; () 



EXPLANATION OF FIGURES 



18 A section of the uterus from animal 1099 9 during the fourth stage, the 

 short period of slight hemorrhage. The beginning regeneration of new epithe- 

 lium from the neck of a uterine gland is shown while simultaneously the break- 

 ing down of the old epithelium is still taking place, and other portions of this 

 section show a loss of the old epithelium from the uterine wall. A smear of the 

 vaginal fluid from the same animal just before killing is shown in figure 9. 



19 A similar section from the uterus of another animal, 860 9 , during the 

 same stage. This shows better the falling off of the old epithelium and the 

 simultaneous formation of new epithelium. 



270 



