40 ROARING IN HORSES. 



were the seat of the malady, but the left 

 always to a greater degree than the other. 



Ablation of the arytenoid is divided into 

 the following parts: — {a) Incision of the 

 mucous membrane along the superior and 

 posterior edges of the cartilage ; {U) section 

 of the vocal cord, dissection of the cartilage 

 upon its inferior and anterior borders, and 

 its external face ; {c) section of the cartilage 

 near its articulation with the cricoid ; 

 (d^ dissection of the superior surface of the 

 cartilage. 



(a) By means of the probe-pointed bistoury 

 and using a slight amount of pressure, the 

 mucous membrane bordering the superior and 

 posterior edges of the arytenoid is incised 

 (fig. lo). The instrument is carried to the 

 opening of the larynx, upon the middle line, 

 then directed from front to back as far as 



