PLATE 4 
EXPLANATION OF FIGURES 
8 Vaginal epithelium of a later phase of stage P. X 275. The granular 
layer now clearly separates the two zones figured in 7 (animal no. 9). 
9 The stratum lucidum of the corneum is forming. > 265. (Animal no. 10.) 
Sloughed-off nucleated cells make up the stage P smear. : 
10 Section of the vagina in stage O. X45. Corneum is well formed, super- 
ficial, and still intact. Free cells form the O smear. 
d 356 
