PLATE 5 



EXPLANATIOX OF FipURES 



14 A section illustrating the condition of the uterine epithelium and the 

 accumulation of large numbers of leucocytes below the epithelium during the 

 second stage of oestrus, from animal 1066 9 . Corresponding smears of the va- 

 ginal fluid at this time are shown in figures 2, 3, and 4 from the same female. 



15 and 16 Sections of the uterus during the third stage of oestrus showing the 

 invasion of the epithelium by migrating leucocytes. The epithelium is partially 

 destroyed and greatly vacuolized, as a result of the dissolving action of the leu- 

 cocytes, but is still adherent to the underlying stroma which also contains 

 leucocytes, leu, leucocytes. Both sections are from 1104 9 and corresponding 

 smears of the vaginal fluid from this animal immediately before being killed are 

 shown in figures 5, 6, 7 and 8. 



17 A section of the wall of the vagina from the same animal, 1104 9 , during, 

 of course, the same stage. The vaginal mucosa is also invaded by leucocytes 

 in a manner similar to that of the uterus, several epithelial cells are seen to con- 

 tain leucocytes within their bodies. The epithelium here is being desquamated 

 or thrown off while the uterine epithelium is seen to be disintegrating before 

 being shed, leu, leucocytes. 



274 



