293 Dr. Honey’s Description of an Apparatus for the 
receiver o o, a quantity of hydrogen gas, equal, when reduced 
to a mean temperature and pressure, to 15.8 cubic inches 
Of these, there remained unconsumed 2.5 
Hydrogen gas burned - - 13.3 
In the receiver b were 49 cubic inches of oxygen gas, con- 
sisting of - - 33.5 oxygen, 15.5 nitrogen 
At the close of the experiment,^ 
there remained, in b, 43.5 c. i. [27.25 16.25 
composed of - - 3 
Cubic inches of oxygen gas con- 
sumed - 
6.25 
But estimating from the first diminution (viz. 49 — 43:5) 
only 5.5 cubic inches of oxygen would appear to have been 
absorbed ; and the nitrogen gas, by eudiometrical experi- 
ments, would seem to have been increased 0.75 of an inch. 
As the hydrogen gas, however, had been prepared from zinc 
and sulphuric acid with extreme caution, and did not contain 
an appreciable quantity of common air, no such addition of 
nitrogen could have taken place. The apparent increase, 
then, may be fairly imputed to the escape of 0.75 of an inch 
of hydrogen gas, which is to be deducted from the 13.3 cubic 
inches at the outset of the experiment ; and hence the real 
quantity consumed will be 13.3 — 0.75 = 12.55. The true 
consumption, also, of oxygen gas was 5.50 -j- 0.75 = 6. 25, 
or pretty exactly, as it ought to be, half the bulk of the 
hydrogen gas, which was actually burned. 
An example of the analysis of a highly combustible species 
of elastic fluid is furnished by the following experiments on 
the okfiant gas, obtained from alcohol and sulphuric acid. 
