' Preventive and Curative Treatment. 139 



lage ; and no great amount of connective-tissue tumefaction 

 should occur to fill up the glottis. 



Professor Bassi, of the Turin Veterinary School, and a 

 few others, tried Stockfleth's method^ and with the same 

 uncertain and, on the whole, unsatisfactory results. 



The exceptional importance of the subject induced Pro- 

 fessor Moller,! of the Berlin Veterinary School, to take it up, 

 and to institute experiments with the same object, and 

 somewhat after the methods of Giinther and Stockfiethj in 

 1887. He tried extirpation of the left vocal cord, but 

 failed to remove the Eoaring. Concluding that the noise 

 was caused by the inferior and posterior portions of the 

 arytaenoid cartilage, attempts were made to effect a cure by 

 fixing this cartilage. To accomplish this, three methods were 

 tried : 1. Opening the articulation between the arytaenoid 

 and cricoid cartilages, from the trachea, and separating part 

 of the connection between these ; this was unsuccessful. 2. 

 Dividing the left dilator muscle, by making an opening on the 

 side of the neck, beneath the parotid gland, and through the 

 constrictor'of the pharynx, with the idea that retraction and 

 cicatrization of the divided muscle would fix the arytaenoid 

 cartilage. This operation was also a failure, as might have 

 been expected, when we know that in the great majority of 

 cases there is little or no muscle left to operate upon. 3. 

 Fixing the arytaenoid to the cricoid cartilage, by attaching it 

 to the upper part of the thyroid cartilage by ligature, without 

 opening the trachea or larynx. Here, again, the result was 

 not satisfactory, for the Roaring continued. Moller then 

 decided to extirpate the arytaenoid cartila,ge, by intra-laryn- 

 geal operation f and in this he appears to have been pretty 

 successful, though he would probably have been more so had 

 he entirely removed it and the vocal cord ; but he claims to 



1 "Das Kehlkopf-Pfeifen der Pferde," Stuttgart, 1888. 



2 1 was not aware that Professor Moller was performing this 

 operation until he kindly sent me a copy of his booklet immediately 

 after its publication, in August. 



