THE MICROSCOPE IN PATHOLOGY. 



245 



cells to take up an abnormal amount of nutritive mate- 

 rial. It occurs after local and general irritations, which 

 bring to the part an increased supply of blood, and is es- 

 pecially important in the muscles and the large glands, as 

 the liver and kidneys. In the latter it is often associated 

 with fatty degeneration and fibrinous exudation, as in 

 Fig. 201. 



FIG. 201. 



1. Cloudy swelling and commencing fatty degeneration of the epithelia of the convo- 

 luted urinary tubuli. 2. Advanced fatty degeneration. 3. Formation of fibrinous cyl- 

 inders, a. Cross-cut of a urinary tubulus, with a gelatinous cylinder filling the lumen. 

 b. Epithelium, c. Tunica propria. d. Renewed production of colloid at the surface of 

 the epithelial cells, which elevates the older. 1-500. After RINDFLEISCH. 



6. Serous Infiltration. 



This is an infiltration of the tissues with a serous or 

 sero-mucous substance producing oedema, and seems 

 analogous to mucoid degeneration. Under the micro- 

 scope bright spots appear in various cells, of which Wag- 

 ner declares it to be uncertain whether they are artificial 

 or diseased products, and if the latter, whether they are 

 serous, mucous, or colloid. 



