DISEASES OF THE RESPIRATORY ORGANS. 81 



around its interior, are considered irremovable; though instances are re- 

 corded in which they are said to have been excised. In recent cases, 

 arising from distortion of the larynx produced by tight reining, the best 

 treatment consists in removal of the cause, and doing away with the 

 check-rein, followed, if necessary, by rubbing daily or alternate days 

 with: 



Iodine 3 i. 



Iodide of potassium 3 ij. 



Lard 3 ij. 



Mix with very gentle heat. 



If the roaring arises from a thickened state of the lining membrane 

 of the bronchial tubes, such as may often be found after catarrh, laryn- 

 gitis, etc., relief may very probably be gained, in recent cases, by apply- 

 ing irritants, such as biniodide of mercury (just mentioned above), 

 repeated at intervals, to the exterior of the part affected; or a seton may 

 be inserted on both sides, just behind the jaw. 



HIGHBLOWING. 



Definition. — Highblowing is not a disease, but is simply produced 

 by the flapping of the horse's nostrils when expelling air quickly from his 

 lungs. The larger, thinner, and more delicate the horse's nostrils are, the 

 easier will it be for him to make this noise, which appears to be under 

 his controh It is rarely heard except at the canter or gallop. It is gener- 

 ally considered to be a sign of good wind. One can imitate the sound near 

 enough to understand how it is made, by bringing the lip slightly together 

 and then blowing moderately strong through them. If one blows very 

 hard, the vibratory noise is not made (Hays). 



WHISTLING. 



" This sound has been generally looked upon as a modification of 



roaring. I am, however, of the opinion that whistling and roaring are 



due to different pathological conditions of the larynx, and that they may 

 6 



