Anatomical Chans 



149 



once or later on, or if portions of lung- have been crnslied. In- 

 jury to the king may be brought about by external violence 

 (wounds, fractured ribs) or, particularly in cattle, by foreign 

 bodies which enter the lungs from the stomach or pericardial 



Foreign hodies do not always cause gangrene but sometimes only an interstitial 

 pneumonia, as is demonstrated not so very rarely by findings on slaughtered animals. 

 The foreign body may even be coughed up (Lisiziu). 



Anatomical Changes. Gangrenous foci, usually quite nu- 

 merous, are found in the lungs, especially in their anterior and 

 inferior portions. These foci appear dirty-brown red or dirty- 



*— r-i 



l-'ig. 2?>. Xasal discharge in pulmonary gangrene of the horse, a, elastic fibers from 

 pulmonary tissue; b, pus corpuscles; c, bacilli; d, cocci. 



yellowish brown; they consist, either at the periphery, or 

 throughout their entire extent, of a mushy mass of very dis- 

 agreeable, sweetish, foul smell. Liquefied or soft masses, which 

 have a similar smell and are likewise discolored, are found also 

 in the bronchi, the mucosa of which is dirty red or slate-gray 

 in color. In the neighborhood of the gangrenous foci and be- 

 tween them, the pulmonary tissue shows the picture of a ca- 

 tarrlial or croupous pneumonia. The internal surface of the 

 cavities that are formed is ragged, eaten out, and is covered 

 with a friable, smeary, stinking, mushy mass. In the rarer 

 more chronic cases one finds in the neighborhood of the cavities 

 a yellowish, or yellowish-gray, purulent, infiltrated zone or a 

 cicatricial grav shell of connective tissue. 



