72 THEORY AND PRACTICE 



Post Mortem. — The lesions depend upon the immediate cause 

 of death: 



1. Asphyxia — lungs black. 

 • 2. Gangrene — lungs green — mortified. 



3. Pneumonia (always limited to certain 



parts ) portions of lung will be red or 

 gray. 



4. In case of impaction there will be more 



or less bloody froth in the tubes. 

 Microscopically there is more or less 

 extravasation of blood into the vesi- 

 cles. 

 Hypostatic congestion of the lungs occurs sometimes. The 

 lung is not as severely congested ; no bloody froth in the 

 bronchioles ; normal crepitation and normal specific gravity of 

 the lung; blood is not forced in — simply due to gravitation; no 

 exudation, no extravasation, no hemorrhage by rhexis or diape- 

 desis. This kind of congestion plays a very important part in 

 diagnosis for forensic purposes. 



Treatment. — Give plenty of fresh air; keep him quiet — do 

 not let the horse be ridden or driven home ; take him tO' the near- 

 est stable and leave him there until he recovers. Clothe him 

 warmdy. Give him stimulants — alcohol, strychnine, atropitie, 

 aromatic spirits of ammonia, digitalis, strophanthus. 



Bear in mind that the congestion is due toi diminished cardiac 

 power. It used to be practiced to bleed horses in this con- 

 dition, but we do not do it any more. The weak heart dictates 

 the rationality of the treatment. Keep the animal quiet for sev- 

 eral days and watch for pneumonic symptoms. Clothe warmly, 

 bandage legs, and keep him on light diet. If gangrene develops, 

 great and sudden weakness comes on, loss of appetite and death. 



PNEUMONIA. 



Definition. — Pneumonia is an inflammation of the parenchyma 

 of the lungs, i. e., the air vesicles. It is divided into several dif- 

 ferent classes : 



