68 ROARING IN HORSES. 



may likewise be wounded by the needle. In 

 most cases where the cartilage becomes 

 inflamed, the mucous membrane becomes 

 tumified, hard, and of an enormous thickness, 

 and intense roaring continues. 



2. Incomplete Deglutition of the Dressing, — 

 When the plugs or the gauze compresses 

 placed in the larynx are not closely fixed, 

 the animal, by its efforts at deglutition, may 

 cause them to pass into the eesophagus. 

 where they are taken hold of by a con- 

 traction of the muscular coat of that tube. 

 The next day, on removing the dressings, 

 the larynx is found empty. The plugs must 

 then be extracted by holding the head 

 extended on the neck, and carefully drawing 

 upon the threads attached to them in a ver- 

 tical or slightly oblique manner and forwards. 



3. Inflammation of the Lungs by Foreign 



