Memoir on Sulphuric Ether. 475 
If the forces registered. in the preceding 
table be allowed as near approximations to 
the truth, it must, I think, be admitted that 
they increase in geometrical progression, to 
the same intervals of temperature for a range 
of 200° at least. Whether those intervals of 
temperature are equal one to another succes- 
sively is another enquiry, which the above 
facts and observations do not enable us to 
decide. 
Analysis of Ether by Electricity, ec. 
When a little fluid ether is let up into 
Volta’s eudiometer, either over mercury or 
water, and a small portion of azotic gas is 
likewise sent up, in order to be vapourized by 
the ether ; then if the vapourized air be elec- 
trified for an hour, some permanent gas is 
produced, and charcoal is precipitated. The 
gas when washed is chiefly or wholly carbu- 
vetted hydrogen ; for it takes two volumes of 
oxygen, and yields one of carbonic acid 
gas, If the vapourized gas be dry and over 
mercury, a volume of vapour yields two vo- 
lumes of carburetted hydrogen, and moisture 
is perceived within the tube.—If the electrifi- 
cation were continued, no doubt the volume 
