142 DISEASES OF THE HORSE. 



The treatment should be the same as in the preced- 

 ing cases, with the exception of the blister, which 

 should be continued from the larynx to the sternum. 



BROKEN WIND. 



Broken wind is marked by a double act of respiration, 

 which would seem to be caused by the admission of air 

 into air-cells unfit for its reception, and from which it 

 cannot readily nor entirely be expelled without an 

 extraordinary muscular effort of the chest and flank. 



The appearances of the lungs of a broken-winded 

 horse, on examination after death, differ to such an 

 extent that it is difficult to assign any general cause of 

 this disease. 



Sometimes there is no structural change evident, the 

 only remarkable condition being increased bulk and a 

 crackling sound on being pressed by the finger, from 

 their being distended with air. However, in most 

 instances, rupture of the cells of the lungs will be dis- 

 covered. 



From what has been said, it will be clear that all 

 attempts at a cure of the disease will be fruitless ; since 

 we have not the mechanical power of creating new air- 

 cells nor of repairing the old ones. Alleviation of 

 suffering, then, is only to be attempted, the best means 

 of accomplishing which will be by attending strictly to 

 the horse's diet, limiting him to a certain quantity at 

 any one time, so that distension of the stomach may 

 not aggravate the difficulty of expanding the lungs. 



