14 ROARING IN HORSES. 



opening of the larynx being thus very much 

 reduced, — the respiration becomes insufficient, 

 painful, and noisy. 



Such is the mechanism of the production 

 of roaring as connected with paralysis of 

 the larynx. The unnatural sound is pro- 

 duced by the obstacle which opposes the 

 accomplishment of respiration ; the arytenoid 

 cartilage and the left vocal cord brought to 

 the middle line become powerless. 



In exceptional cases of total paralysis the 

 two arytenoids are carried together in front 

 of the glottis during inspiration, and the 

 vocal cords execute the same movement, 

 thereby considerably reducing the calibre of 

 the upper part of the larynx, and the 

 roaring is heard at its maximum degree. 



