60 



EXPERIMENTAL PHARMACOLOGY 



sired. The drum should turn at a moderate speed. Some 

 ether is now placed in the ether bottle and by means of a 

 hand bellows a current of air and ether vapor can be passed 

 through the gas chamber (Figs. 52 and 53). Just before the 

 other is applied several contractions of the muscle should 

 be recorded to serve as normal controls. These controls 

 should be obtained both from the needle and from the boot 



GEBAUER5 ETHYL CHLORIO CR 



Fig. 54. Three forms of containers for ethyl chloride. The Gebauer container is 



preferred. 



electrodes. These records should be carefully preserved 

 and compared with those obtained later. When the normals 

 have been secured then pass a small amount of ether vapor 

 through the chamber and then again stimulate the nerve 

 with the needle electrodes. What action has the ether had 

 on the irritability of the nerve! Stimulate with the boot 

 electrodes. Has the conductivity of the nerve been af- 

 fected? Is this a fair test? 



