88 



EXPERIMENTAL PHARMACOLOGY 



Operator 



Fig. 86. An aneurism needle is used to lift up the trachea while the forceps (holding 

 the end of a heavy string) are passed beneath the trachea. 



Cut Trache? 

 3/y thru, cross 

 n wise, between 

 rinqs. 



loosely 

 tied on 



Fig. 87. The string is tied loosely and the forceps are left in position to hold up the 

 trachea which is cut crosswise about three-fourths in two with the scissors. 



