86 



EXPERIMENTAL PHARMACOLOGY 



fascia back of the trachea. About half the length of the 

 forceps is pushed through below the trachea and the for- 

 ceps are thus left in place to hold up the trachea. The end 

 of the twine is taken out of the forceps and the twine is 

 drawn through a little over half its length (Fig. 87). The 



Left hand of 



" Incision -thru skin . 

 fascia fo Muscle. 



Fig. 83. Method of incising the skin over the trachea. 



twine is then tied loosely and with scissors the trachea is 

 cut crosxn-ixi' about three-fourths in tiro (Fig. 87). AVith 

 large sharp-pointed forceps the operator (right hand) now 

 holds open the cut portion of the trachea while the assist- 

 ant (right hand) pushes in the tracheal cannula (Fig. 88). 

 This is at once tied in and connected with the ether bottle 



