4°6 Mr. Henry’s Experiments on 
from oxygenated muriate of pot-ash, was so pure, that the small 
quantity used in this experiment could not contain a measurable 
portion of azotic gas. 
Experiment 2. The same quantity of carbonated hydrogen 
was expanded by repeated electrical shocks to 188 measures. 
The addition of hydrogenous gas, therefore, amounted to 93,5. 
The gas, thus dilated, was fired, at different times, with 392,5 
measures of oxygenous gas ; and the residue, after these several 
explosions, was 203 measures. Lime water reduced it to 128,5, 
and sulphure of pot-ash to 19,5. In this instance, as in the for- 
mer one, the product of carbonic acid is 74,5 measures. 
Finding, from the first experiment and other similar ones, 
that the carbonated hydrogenous gas, which was the subject of 
them, contained a very large admixture of azotic gas, I again 
submitted to distillation a quantity of the acetite of pot-ash, 
with every precaution to prevent the adulteration of the product 
with atmospherical air. Such an adulteration, I have observed, 
impedes considerably the dilatation of the gas, and for a time 
even entirely prevents it. This explains the failure, which some 
experienced chemists have met with, in their attempts to ex- 
pand the carbonated hydrogenous gas by electricity. Gas which 
is thus vitiated becomes, however, capable of expansion, after 
exposure to the sulphure of pot-ash. 
Experiment 3. Carbonated hydrogen 340 measures were ex- 
ploded with the proper proportion of oxygenous gas. The car- 
bonic acid produced amounted to 380 measures, and the resi- 
due of azotic gas was 20 measures. 
Experiment 4. The same quantity, when expanded to 690, 
gave on combustion 380 measures of carbonic acid, and 19,8 
of azotic gas'. 
