20 ROARING IN HORSES. 



After having assured himself no cure could 

 be obtained by excision of the vocal cords, 

 Moller, convinced that the obstacle producing 

 roaring was situated at" the upper orifice of 

 the larynx, made a number of experiments 

 with the object of restraining the movements 

 of the arytenoid by ankylosing it to the 

 cricoid or by fixing it to the thyroid. 



The first proceeding was to cut through 

 the cricoid and the first two rings of the 

 trachea in the middle line ; then, by means 

 of a pointed bistoury, to open the crico- 

 arytenoid articulation by incising the capsular 

 ligament of that joint, the patient being then 

 left alone for some weeks. It was hoped 

 that the arytenoid, ankylosed to the cricoid, 

 would not again fall down from the pressure 

 of inspired air. The greater number of the 

 horses thus operated upon were sensibly 



