CYSTIC DISEASE OF THE URINARY TRACT IN MAN 71 



Another part of the same section (Fig. 23) shows other stages of 

 cyst-formation ; collections of epithelial cells are indicated at b and 

 c ; the one marked b contains a central space. These are two of 

 Brunn's epithelial nests, a possible origin of the ureteral cysts. In 

 the same figure is a small cyst, the contents of which in optical 

 characters and staining reactions are the same as that in Fig. 22, 

 but they are passing, in the form of small granular bodies, at the 

 point d into the tissues beyond the cyst. 



Still another part of the same section is show r n in Fig. 24, where 

 the relation of the cysts to the mucous membrane is seen. The 



' ^*v~* 



FIG. 23. CYSTIC DISEASE OF THE URINARY TRACT. 



Another part of the same section : <2, Epithelium of the mucous membrane ; b and 

 <:, Brunn's nests, perhaps early stages of cyst-formation ; d, points to where 

 the contents of a cyst, in the form of amoebae, are passing into the tissue 

 beyond the cyst. (Low power.) 



material contained in some of the cysts e.g., Fig. 24, b is sub- 

 dividing into small fragments ; these fragments, examined under a 

 higher power, I found to have the same structure as those shown 

 below in Fig. 25, a, which represents part of a cover-glass prepara- 

 tion made from the fresh contents of a cyst. The drawing was 

 made carefully with the camera obscura under a magnification of 800 

 diameters. 



Returning to the first of the illustrations, we may with advantage 

 examine the cyst containing the oval bodies under a higher power, 

 as shown in Fig. 26. There we see a flattened epithelial lining, a, b ; 



