TRACHEOTOMY. 



483 



Pig. 438.— Tube of Leblanc, mounted 



Pio. 429.— Tube of Kenault. 



Fig. 430.— Tube of Peuch. 



The operator stands facing the animal, slightly on the right. 

 Grasping the trachea (the hair having been closely clipped), he 

 fixes and stretches the skin with the left thumb and fore finger, at 

 about the middle of the tracheal region, and incises it with a sin- 

 gle stroke of the convex bistoury, cutting through the sMn and 

 the cutaneous muscle. The incision is about three inches in 

 length, and exposes the stemo-hyoideus and thyroideus muscles. 

 These must be carefully isolated from the face of the trachea by 



