258 PATHOLOGY OF THE BLOOD AND CIRCULATION. 



coli, gonococcus, and others occasionally prove pyogenic. 

 Around the central fluid mass, the pus, there is first a layer 

 which is soon to become pus, next a zone of inflammation and 



FIG. 99. 





Parenchymatous nephritis, a, cross-section of a convoluted tubule of the kidney, 

 the lining epithelium of which is the seat of albuminoid degeneration. The 

 cells are swollen and their bodies filled with abnormally coarse granules. The 

 cells to the left are so far disintegrated that the nuclei 'have lost most of their 

 chromatin. Such cells cannot recover. The cells to the right are less pro- 

 foundly altered and their nuclei retain sufficient chromatin to stain slightly. 

 These cells might, perhnps, recover. Other convoluted tubules similarly 

 affected are represented in oblique section, b, tubule with low, unaffected 

 epithelium, the nuclei of which stain deeply ; c, round-cell infiltration of the 

 interstitial tissue in the neighborhood of a Malpighian body, the edge of which 

 is just above the line c. Section stained with hsematoxylin and eosin. 



repair, and then healthy tissue. If such an inflammatory 

 process occurs on the skin or a mucous membrane, the result- 



