38 GENERAL HISTOLOGY. 



teristic proliferation of bioplasm with albuminoid exudation, 

 and granular cloudiness with falling of the epithelial lining of 

 the tubules. Eczema is a chronic catarrh of the skin from 

 hyperaemia and proliferation of the cells of the papillary layer. 

 The horny layer of the epiderm is destroyed, and the multi- 

 plying epithelium cast off 



(3) \\-\fibrinous exudation the fluid from the hypenemic ves- 

 sels coagulates into fibrin, between whose meshes serum is 

 confined. Pus is generally present. This form generally oc- 

 curs on the surface of serous membranes, and the coagulated 

 fibrin either glues together adjacent surfaces or forms a slightly 

 adherent membrane, as the false membrane of rheumatic pleu- 

 ritis or pericarditis. 



(4) Croupous exudation differs from fibrous, according to 

 Wagner, by originating from a peculiar metamorphosis of 

 epithelium, although others think the croupous network to be 

 like the fibrous network of inflamed serous membrane. The 

 croupous exudate appears 'as a deposit or membrane upon su- 

 perficial organs, as the air passages in croup, or air cells in 

 croupous pneumonia. Underneath the exudation the mucous 

 membrane is swollen and hyperaemic. 



(5) Diphtheritic exudation is from a greater degree of hyper- 

 aemia in the mucous surface than in the croupous form, at- 

 tended with a gangrenous separation of infiltrated parts. Some 

 regard it as an exaggerated croupous exudation, and others, as 

 Buhl, consider it an acute tissue necrosis quite distinct from 

 croup. 



(6) H amor rhagic exudations wt those which contain so many 

 red blood corpuscles or their coloring matter as to appear red. 

 This may occur with or without visible injury to the blood- 

 vessels, as in hemorrhagic measles, smallpox, scurvy, etc. 



5. By the resolution of inflammation is meant its gradual 

 subsidence, and the return of the tissues to a normal or 

 healthy state. The congestion of the vessels lessens and dis- 

 appears, and the emigration of the cells ceases. Some of the 

 emigrated cells are removed whole by the lymphatics, while 

 others undergo fatty degeneration and lactification and are then 

 absorbed. Necrosed tissues disintegrate and liquefy, and are 



