CHAPTER X. 



THE OPERATION FOR ROARING. 



Having stated the results of operation for Roaring, so far 

 as they have been ascertained, it now remains to describe 

 (1) the operation itself, and (2) the after-treatment. It 

 is of course understood that the operation is intra-laryn- 

 geal, the larynx being opened from the front. This has 

 been found to be the simplest, safest, and most expeditious 

 operation, as well as the most certain in its results, of any 

 yet attempted for removing the obstruction to respiration. 



1. Operation. 



Apparatus and Instruments Necessarv:. — These con- 

 sist of: 



1. Hobbles for casting the horse. 



2. Side-line, or piece of rope. 



3. Twitch, which may be necessary to ensure quietude 

 before casting. 



4. Chloroforming apparatus. Carlisle's chloroform bag 

 or muzzle (Fig. 10) is the best. This consists of a leather 

 bag fitting closely over the nose, with an aperture at the 

 bottom, into which a tray slides. This tray is of tin, and 

 is furnished with a sponge covered by a perforated metal- 

 plate (A). The chloroform is poured upon the sponge when 

 the horse is cast, and the tray is slipped into the aperture 

 in the bag, which is then fastened on the horse's head. 

 Between the perforated plate and the nose a few small 



