Anaesthetics. 45 



COMMENTS. 



Two things are here dearly shown : 



Firstly, that the effects of this direct injection are 

 too evanescent, and that the ordinary inhalation is 

 infinitely preferable. 



Secondly, and this is important, that chloroform 

 vapour will escape from the blood if it can, and that 

 so long as respiration goes on, there is a great chance 

 of a person apparently dead from chloroform being 

 resuscitated. This I have repeatedly proved by 

 experiments on dogs in our laboratory, by using 

 the Cambridge Scientific Instrument Co.'s artificial 

 respiration pump. 



-flSther. 

 EXPERIMENTS. 



Twenty-five minims were injected into the femoral 

 vein of a small noisy dog. 



Result. The dog became quite quiet, but not 

 insensible. I then, almost immediately, injected 

 xv m. more.* 



Result. In two seconds, he became insensible ; 

 pupils dilated. I cut off the dog's leg. He soon 

 recovered; but the whole surface of his body and 

 limbs remained perfectly anaesthetic for some time 

 afterwards, not taking any notice of cutting or 

 pinching. 



* The two doses represent, approximately, half a litre of the vapour 

 of ether at the ordinary temperature, 15'5 C., or 60 Fahr. 



