PNEUMONITIS; PNEUMONIA; INFI^AMMATION 

 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, nature, and complications : thus : 



Single Pneumonia : Affecting one lung : rig-kt or left. 



Double Pneumonia . Affecting both lungs. 



Lobar Pneumonia : Affecting one lobe or by lobes. 



Lobular Pneum.onia : Affecting by lobules. 



Acute Pneum.onia : Subacute Pneumonia. Chronic Pneumonia. 



Croupous or Fibrinous : With fibrinous exudate. 



Catarrhal : With exudate rich in cells and granules. 



HcBmorrhagic : With extravasation of blood. 



Purulent : Tending to pus : abscess. 



Necrotic : Tending to gangrene : sequestra. 



Desquamative : With great proliferation of alveolar epithelium. 



Interstitial. 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 Pneumonia. 



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 more 

 generally, as fibrinous pneumonia, catarrhal or broncho-pneu- 

 monia, and inhalation pneumonia, and under the headings de- 

 voted to etiology, pathology, therapeutics, etc. , attention will be 

 given to distinctions. Those pneumonias that are but pulmo- 

 nary manifestations of other diseases — influenza, glanders, tuber- 

 culosis, strangles, contagious pneumo-enteritis, lung plague, 

 septicsemia, pyaemia, swine plague, hog cholera, petechial fever 

 actinomycosis, and neoplasms will be considered under these re- 

 spective headings. 



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