152 Dr. Henry on the aeriform compound s 
nation of that portion of it which remains after the action of 
chlorine. The gas, submitted to these recent experiments, was 
prepared from Wigan cannel, at the manufactory of Messrs. 
Philips and Lee. It was collected from an opening in a pipe 
between the retort and the tar-pit, generally about an hour 
after the commencement of the distillation, except in the in- 
stance of the gas No. 4, which was taken five hours, and No. 
5, which was taken ten hours, from that period. Before using 
it, the carbonic acid and sulphuretted hydrogen, which were 
always present in the early products, were separated by care- 
ful ablution with liquid potash. As the gas No. 5, was not 
at all diminished by chlorine, it was obviously unnecessary 
to examine it in any but its entire state. 
Table II. Containing the results of experiments on the gas 
obtained from coal. 
Entire Gas. 
Gas left by Chlorine. 
Experiment. 
Sp. Gr. 
100 volumes. 
a. 
Loss by 
Chlorine. 
Sp. Gr. 
100 volumes. 
A 
< ^ 
Take oxyg. Give car. ac. 
r 1 
Take oxyg. Give car. acid. 
1 
2 
3 
4 
5 
.650 
.620 
.630 
.500 
•345 
217 128 
194. 106 
196 108 
166 93 
78 3 ° 
*3 
12 
12 
7 
0 
•575 
.527 
•535 
.45c 
178 92 
160 82 
148 8o£ 
J 4 ° 75 
Inferences respecting the composition of that part of the gases 
from coal and from oil, which is not condensible by the action 
of chlorine . 
The analytical experiments, which I have described on the 
action of chlorine on artificial mixtures of olefiant with hy- 
drogen and carburetted hydrogen gases, afford no room for 
