312 EDGAR ALLEN 
The uterine and ovarian vessels were congested (two or three 
times larger than during the D period), and the uterine cornua 
were much distended. When the animal was killed the uterus 
did not expel this fluid (as the bladder expels the urine) and when 
held up between the observer and the light, the uterine cornua 
are so transparent that the folds of the mucosa are easily visible. 
The ovarian capsules were not distended. 
Cross-sections of the vagina show a fairly large lumen con- 
taining some nucleated epithelial cells and a very few apparently 
degenerate polymorphonuclear leucocytes. The epithelium shows 
a basement membrane in a few restricted regions. There are 
twelve to thirteen layers of epithelial cells, of which the outer 
four to five layers stain very lightly with eosin. This demarca- 
tion is made still clearer by a well-formed granular layer which 
serves as a line of division. The layers superficial to this are not 
so flattened as those immediately underlying the stratum granu- 
losum. There are as yet no other signs of cornification (fig. 8). 
Mitoses are abundant in the germinativum. The epithelium is 
free from leucocytes except for a very few in the most superficial 
layer of cells. The nuclei of the stroma are loosely packed and 
intercellular spaces are everywhere evident. The sagittal sec- 
tion shows the same conditions, except that a thin cornified layer 
still remains on the ventral side of the vagina at its opening on 
to the vulva. 
The cervical epithelium just before it merges into the simple 
epithelium of the uterus, although at this point being only from 
three to five layers high, is yet divided into two regions, a deep, 
darkly staining, and a superficial, lightly staining one. It is 
similar in most respects to that of the vagina except as regards 
height. 
The lumina of the uterine cornua are large. The fluid with 
which they are distended is not coagulated by Bouin’s reagent. 
There are no cells of any sort free in the lumina. The epithe- 
lium is low columnar and has a distinct basement membrane in 
all but a few regions. Mitoses are frequent. No leucocytes are 
to be found in the epithelium and only an occasional one is in 
the subepithelial zone which is most heavily infested by them 
