4^3 
of carbon and hydrogen, &c. 
mixtures made with air or oxygen for detonation, I could 
readily separate the vapour by means of olive oil ; and when 
olefiant and other gases were present, its solvent power over 
them was prevented, by first agitating the oil with olefiant 
gas or with a portion of the gas to saturate it, and then using 
it for the removal of the vapours. 
In the same way some of the more fixed essential oils may 
be used, as dry oil of turpentine ; and even a portion of the 
condensed liquor itself, as that part which requires a tempe- 
rature of 220® or 230° for its ebullition : care being taken to 
estimate the expansion of the gas by the vapour of the liquid, 
which may readily be done by a known portion of common 
air preserved over the liquid as a standard. 
With reference to the proportions of the different sub- 
stances in the liquid as obtained by condensation of oil gas, 
it is extremely difficult to obtain any thing like precise results, 
in consequence of the immense number of rectifications re- 
quired to separate the more volatile from the less volatile 
portions ; but the following table will furnish an approxima- 
tion. It contains the loss of 100 parts by weight of the 
original fluid by evaporation in a flask for every 10° in ele- 
vation of temperature, the substance being retained iif a state 
of ebullition. 
100 parts at 58° 
had lost at 70° 
parts. 
1.1 . 
differences. 
1.9 
0 
0 
00 
- 
3.0 
- 
2.2 
90° 
- 
5.2 
- 
- 
100® 
- 
7.7 
- 
- 2.4 
110° 
- 
- 10.1 
- 
3.1 
