THE SKELETON. 61 



ing from the latter, in that it can be noticed even 

 if the animal is completely at rest and in the 

 stable, it originates from the lodgment of mucous 

 matter in the bronchical tubes. 



Whistling is also a modification of roaring and 

 differs from the same in that it does not appear 

 after excitement or sudden motion, only after 

 lasting motion, and the noise it produces is more 

 shrill. It originates from contraction of the larynx. 



Broken Wind originates from rapture of some of 

 the aircells of the lungs, the inspiration being ef- 

 fected readily by a single effort as usual, but the 

 expiration requiring a double, and in very bad 

 cases, even several efforts to expel the breath. 

 "When the horse is at work, this disease cannot be 

 mistaken. A loud sobbing breath and the labor- 

 ious heaving and jerking collapse of the flanks in- 

 dicate this defect. It is accompanied by a hard and 

 husky cough. This disease can never be cured. 



Horses, having any of these diseases become 

 speedily exhausted by work and are absolutely un- 

 sound. There are various ways to detect these 

 defects. The usual way is to grasp the horse's 

 throat from the front near the mouth of the larynx, 

 compress the same forcibly so as to cause him 

 to cough. A sound horse will cough but once and 

 recover his breath with a clear deep inhalation 



