346 



DISEASES OF THE RESPIRATORY ORGANS. 



alveolar exudate in places; appearing even a few days after 

 the onset of the disease, were intra-alveolar plugs of newly 



FIG. 153. 



< **' 



Interstitial pneumonia (from a case of unilateral " cirrhosis" of the lung). The 

 bronchi were much dilated, and there was a complete absence of any caseous 

 change. The drawing shows the new fibre-nucleated growth both in the alveolar 

 walls and in the interlobular tissue, also the pigmentation. At a a divided 

 vessel is seen. With a higher power a delicate reticulum is visible between the 

 cell-elements. X 100 (Green). 



formed fibrous tissue, well supplied with bloodvessels com- 

 municating with those of the alveolar walls. 



GANGRENE. 



Gangrene of the lungs occurs as the result of obstruction 

 of the pulmonary or bronchial arteries, and in the course of 

 typhoid and other infectious diseases. It may follow a pneu- 

 monia ; result from a wound of the lungs ; or be due to press- 

 ure, as by an aneurism or by some foreign body in a bron- 

 chus. It may also result from the extension of necrotic proc- 

 esses from neighboring structures. There are two varieties : 

 the circumscribed and the diffuse. 



In the circumscribed variety there are usually one or more 

 small foci in each lung, blackish, even greenish in appearance. 

 These foci have a most offensive odor, are soft and pultaceous, 

 and are surrounded by congested or hepatized lung-tissue. 



Diffuse gangrenous areas may result from the coalescence 



