LOEULAR PNEUMONIA. 



343 



degenerative changes in the myocardium is the most frequent 

 cause of death. 



FIG. 152. 



Croupous pneumonia gray hepatization showing the large accumulation of cellu- 

 lar elements within one of the pulmonary alveoli, which in some parts have 

 undergone such extensive fatty degeneration that their distinctive outlines are 

 no longer visible. X 200 (Green). 



LOBULAR PNEUMONIA. 



In lobular or bronchopneumonia the inflammatory process 

 does not involve large areas of lung-tissue, though the coales- 

 cence of the smaller lobular areas of consolidation, which are 

 more or less widely distributed throughout both lungs, may 

 simulate a lobar pneumonia. 



Etiology : Lobular pneumonia may be a primary affection ; 

 but it is much more frequently secondary, occurring in the 

 course of influenza, w T hooping-cough, measles, and other infec- 

 tious diseases. In animals it can be experimentally produced 

 by causing them to inhale steam or other irritating vapors; 

 or by section of both vagi the glottis being rendered insen- 

 sitive, saliva and portions of food carrying harmful micro- 

 organisms are brought to the finer bronchi by inspiration. 



