1906.] 



The Pharmacology of Ethyl Chloride. 



399 



I conclude, therefore, that the effect of ethyl chloride upon the central 

 vaso-motor mechanism, as was shown to be the case for chloroform by 

 Gaskell and Shore (8) and myself (9), is, for a time at least, stimulative. 



(3) The Resultant of the Combination of the Effects of Ethyl Chloride upon 

 Arteriolar Muscle and Vaso-motor System in the Intact Animal. 

 This was investigated by taking simultaneous blood-pressure and plethys- 

 mography records during the administration of ethyl chloride. Additional 

 evidence was furnished by vertical rotation of animals under deep ethyl 

 chloride narcosis. 



Fig. 7 represents the simultaneous record of blood-pressure and volume of 

 a piece of bowel, following the administration of air containing 30 per cent, 

 of ethyl chloride to an intact dog. 



Fig. 7. — f size of original. 



