148 Roaring in Horses. 



with an indiarubber bag surrounding its middle. This 

 bag is inflated by an india-rubber air-pump after the tube 

 has been inserted in the trachea, and is useful in preventing 



Fig. 12. 



blood flowing into the bronchi during the horse's getting 

 up after the operation, and for half an hour subsequently. 



10. Razor-shaped knife, for excising the arytsenoid carti- 

 la^'-e (Fig. 13). This knife, suggested by Moller, has the 



Fig. 13. 



end of the blade like that of a razor, and is consequently 

 safer than a scalpel. The blade is 3J inches, and the 

 handle 8 inches long. 



Fig. 14. 

 11. Bent knife, for removing the muscles from the out 



side of the arytenoid cartilage (Fig. 14). 

 the blade is 3 inches, and handle 4 inches. 



The 



length 



of 



