of Charcoal and Hydrogen. 171 
from that period. Before using it, the carbonie acid and sul- 
phuretted hydrogen, which were always present in the early pro- 
ducts, were separated by careful ablution with liquid potash. As 
the gas No. 5 was not at all diminished by chlorine, it was ob- 
viously unnecessary to exainine it in any but its entire state. 
Tare II. Containing the Results of Experiments on the Gas 
. obiained from Coal. 
Entire Gas. ii Gas left by Chlorine. 
100 volumes | 100 volumes 
. Pn 2 [( _ 
‘afar “ISp. Gr| take give | thay & Sp. Gr. take give. 3 
oxyg- Car.ac. _ joxyg. car. ac 
] *650| 217 | 128; 13 575 | 178) 92 
2 *620) 194 | 106 12 527 | 160 | S82 
3 *630/} 196 | 108 12 *535 | 148} SOL 
4 | :500| 166) 93 7 450! 140) 75 
5) 345| 78) 30 0 
Inferences respecting the Composition of that Part of the Gases 
from Coal and from Oil, which is not condensable by the Ac- 
tion of Chlorine. 
The analytical experiments, which I have described on the 
action of chlorine on artificial mixtures of olefiant with hydrogen 
and carburetted hydrogen gases, afford no room for doubt that 
by that agent the quantity of olefiant gas in any mixture of these 
gases may be accurately determined. We are not, however, ac- 
quainted with any chemical agent, either liquid or aériform, 
which, from a mixture of hydrogen, carburetted hydrogen, and 
carbonic oxide, is capable of separating one of those gases, leav- 
ing the others in their original state and quantity*. The only 
method at present known of determining the composition of such 
a mixture is by firing it with oxygen gas, and from the phano- 
mena and results of the process, deducing the proportion of its 
‘ingredients. In drawing conclusions of this kind, it is necessary 
to have distinctly in view the properties of those gases in their 
separate state. The following Table contains an abstract of 
their leading characters, which will be found very useful in such 
investigations. Though not strictly necessary, I have included 
olefiant gas, in order to render the Table more complete. 
* I have not found that chlorine can be employed with any success in 
analysing such mixtures ; for when placed in contact with two or more of 
‘those gases, and exposed to light, it does not act upon one exclusively, but 
upon all that compose the mixture. 
TABLE 
