TRACHEOTOMY BY TUNCTURE OR INCISION. 
197 
be placed so that the front of the neck is well lighted. A twitch is 
applied, and the horse, if still restless, has each ear held hy a stiong 
Eig. 36 .—Making the incision. Fig. 87.—Introducing the canula. 
man. The head is moderately raised, and the hair clipped from the 
seat of operation in a narrow strip, 8 to 4 inches in length, in the 
Fig 88 —Method of performing tracheotomy .—a Square opening ; 
c, oval opening. (Henng.) 
b, simple incision ; 
middle line of the neek. The operator grasps the skin with the left 
hand and with the aid of an assistant lifts a horizontal fold about 
1 inch high, and exactly in the centre of the shorn patch ; an incision is 
then carried through the fold. This prevents the skin wound being 
