= 264 — Correspondence of J. Nickles. 
of mercury, and the vapors answering best are those of alcohol, sulphuret 
d camphene. De la Rive has applied the experiments to 
of carbon 
the i 
A 
1 sable auxiliary in such operations. se 
A girt of these balloons is put around the submerged body, the ba 
loo: i i stopcocks to sh 
‘ quite similar to those of ether, but more fugitive ; and while with the 
latter, the inhalation should be interrupted at intervals, with carbonic acid, 
1€ reverse is true. e atlirms: 
we ne as it is wished to pr olong the sleep the inhalations should be 
nu : 
b. They may be continued ten, twenty, thirty minutes and more, with- 
out danger to life. nae 
* 
hly interestin 
ed a gas-bag containing 100 litres of carbonic acid, and resolved 
the anesthesis as long as was possible. The animal was asleep 
‘minutes without convulsions, and so remained, exten: 
inhalations were continued for eighty-seven minu 
withdrawn. The sleep was prolor 
