PNEUMONITIS; PNEUMONIA; INFLAMMATION 

 OF THE LUNGS. 



Definition. Inflammation of the spongy tissue of the lungs un- 

 complicated by that of the bronchia or pleura. 



Divisions. This affection has been variously divided according 

 to seat, 7iat2cre, and complications : thus : 



Single Pneumonia : Affecting one lung : 7'ig-lit or left. 



Double Pneumoiiia : Affecting both lungs. 



Lobar Pneumonia : Affecting one lobe or by lobes. 



Lobular Pneumonia : Affecting by lobules. 



Acute Pneumonia : Subacute Pneumonia. Chronic Pneumonia. 



Croupous or Fibrinous : With fibrinous exudate. 



Catarrhal : With exudate rich in cells and granules. 



HcE7norrhagic : With extravasation of blood. 



Purulent : Tending to pus : abscess. 



Necrotic: Tending to gangrene : sequestra. 



Desquamative : With great proliferation of alveolar epithelium. 



Literstitial. Interlobular : Affecting mainly the interlobular 

 connective tissue. 



Hypostatic : Dependent on gravitation of the blood. 



Metastatic: Due to embolism. 



Parasitic: Caused by parasites. Due to wounds or foreign 

 bodies. 



Contagious and Traumatic Pjiezimonia. 



Many of these are, however, but localizations of the same affec- 

 tion and others are manifestly microbian diseases which in the 

 present .state of pathology it is not always easy to early distinguish 

 .sufficiently 'for clinical and therapeutic purposes. For the sake of 

 convenience therefore pneumonia will here be treated of generally, 

 and under the headings devoted to etiology, pathology, thera- 

 peutics, etc., attention will be given to distinctions. Those pneu- 

 monias that are but pulmonary manifestations of other diseases — 

 influenza, glanders, tuberculosis, strangles, contagious pneumo- 

 enteritis, lung plague, septicgemia, pyaemia, swine plague, hog 

 cholera, petechial fever, actinomycoses, and neoplasms will be con- 

 sidered under these respective headings. 



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