70 PROTOZOA AND DISEASE 



To the above account I need only add that around the cysts in 

 the bladder were recent ecchymoses, as if due to acute inflammation, 

 and that the bright globules consisted of albuminous matter and not 

 of fat ; this was shown by making cover-glass preparations and 

 passing through the usual series of reagents. 



A brief objective survey of the histology of this case will best 

 convey the chief features of the minute anatomy. A section of part 

 of the ureter bearing some of the cysts, as seen under a low power of 

 the microscope, is shown in Fig. 22, in which is seen an epithelium- 



FIG. 22. CYSTIC DISEASE OF THE URINARY TRACT. 



Section of a cyst in the pelvis of the kidney under a low power, showing the general 

 character of the cyst-contents. At a is an invagination of the mucous mem- 

 brane, as if preparatory to formation of a new cyst. 



lined cyst filled with a material which is somewhat like the ' colloid ' 

 of the follicles of the thyroid gland, except in that it contains some 

 large oval cells. How came these cysts to be formed in the pelvis 

 of the kidney and in the ureter, where, as far as my own examination 

 of the structure of one normal ureter, is to be trusted, no glands 

 exist in the normal condition ? On the right side of the cyst is a 

 depression in the mucous membrane, and to the right of that, again, 

 a projection (papilla) with secondary lateral offshoots ; these 

 together may, in my opinion, be the beginning of the formation of 

 a new cyst. 



