Memoir on Sulphuric Ether. 467 
5 inches of water, which was of course di- 
minished a little in its passage, and then 
spread over the surface of the water, to the 
thickness of ,2, of an inch nearly.—The 
volume of air and vapour varied as under. 
H. M. 02. 
=n aesetee enone 20 
<= Biacbecece oer 224 
ee ee 24 
=U | eee, 26 
===) SAN osesveuensanes 272 
— DB reeverssenees 284 
BD civsacsee vce 281 
— 60.. - 28 
O27 aap assanstatey 27 
1 Day cocccecccccererees 23 
W WEEK ~\cactcarchemesss 212 
Washed .....+000 20 
Here it is observable, the vapour increased 
for half an hour and then began to decline 
again, but slowly. It increased the volume 
by 8% 0z.=3960 grain measures, which is 
equal to 15 grains in weight by the preceding 
determination ; but the ether weighed 22 
grains; so that a loss of 3 of the weight of 
the ether only, was occasioned by the action 
of so great a surface of water on it for half 
an hour. 
