98 



Chronic Alveolar Bloating. 



Vside from its rapid development acute bloating of the 

 luno- is distinguished by the fact that it either comes on as a 

 concomitant affection iii acute disease of the lungs, or during 

 hard work or after a long railroad transport, and that it dis- 

 appears again after amelioration of the primary disease or 

 during rest. It must, however, not be forgotten that the factors 

 mentioned mav also su(klenly increase the s>miptoms of chronic 



Time 



Fig. 10. Pneumograph of a horse with pramonnry emphysema, a before in. lect ion 

 of atropine, (marked dyspnea with double expiration) ; b l^ inmvites a ter he m ec- 

 tionof 0.05 gm. of atropine, (dyspnea has disappeared) ; c VA hours after tlie injec- 

 tion ; d 17 liours after the injection, (dyspnea ayani very markctt) . 



emphysema or that their discontinuation may much improve 

 the clinical picture of emphysema. Interstitial emphysema is 

 characterized by a rapidly increasing dyspnea, without the 

 possibility of demonstrating a displacement of the boundaries 

 of the lungs, and frequently with the development ot sub- 

 cutaneous emphysema. Pneumothorax is characti^nzed^ by a 

 sudden onset, by a metallic percussion sound and by similar 

 breathing sounds. 



