On Oil and Oil-gas. 76 
oxygen. This supposition would fall within 
the compass of some of the results. 
I think it is perhaps as probable as the con- 
trary that both these new compounds exist in 
oil-gas; but as no reason seems to exist why 
the olefiant gas of the Dutch chemists, or 
that from alcohol, should not be found in 
the decomposition of oil, it would seem the 
most simple way of accounting for the phe- 
nomena to suppose that part of the gas from 
oil which we have called superolefiant to be 
a mixture of the ordinary olefiant gas, and a 
new one of double its power. It is not pos- 
sible however to reconcile the results above 
with this supposition, They require the two 
new gases or combinations of gases above 
suggested, and in this case we can do without 
the aid of any olefiant gas properly so called. 
At present the subject must remain in uncer- 
tainty. 
In prosecuting this enquiry it struck me 
that the olefiant gas mixed with coal gas, 
might propably be of this new kind. From 
Dr. Henry I received a specimen of coal gas 
of the first quality, which on examination 
gave the results below :— 
100 Measures, gave 128 carb. acid—took 233 oxygen. 
16 Superolefiant——46 — 7i 
Consisted of 5 82 Resid.comb,_— 82. —=—#- ——— —— 162 ———= 
2 Azote 
