412 
Mr. Henry’s Experiments on 
electrified and unelectrified gas, should be made without the 
intervention of any time that could vary the proportion of 
azote in either of the gases. 
To the 9th experiment, in which the quantity of azote seems 
to have been increased by electrization, I must repeat the ob- 
jection, that a sufficiency of oxygenous gas was not used in the 
combustion. In the 8th experiment, 2,83 of the unelectrified 
air were fired with 4,17 oxygenous gas, and only 0,13 of the 
latter remained above what was sufficient for saturation ; but 
in the 9th, though the 2,83 measures were expanded to 5,16, 
the quantity of oxygen employed was 0,08 less than in the 
former experiment ; and it may therefore be presumed that a 
small quantity of inflammable air might escape unaltered, and 
might add apparently to the product of azote. In the 8th ex- 
periment also, the portion of oxygenous gas that was more 
than sufficient to saturate the carbonated hydrogen, would 
probably combine, in part, with the remaining azote, as in the 
experiments of Dr. Higgins* and Dr. Priestley. -f But in 
the 9th, the quantity of oxygenous gas was hardly sufficient to 
saturate both kinds of inflammable air after electrization, and 
could not therefore diminish the azotic gas. When the pro- 
portion of oxygen is duly increased, and the inflammation of 
the electrified air is performed in small portions, there is no 
augmentation, but on the contrary a decrease of the quantity 
of the azote, as will appear on comparing the 1st and 2d of the 
experiments which I have related. 
Two circumstances were observed, in the experiments of Dr. 
Austin, which have not been noticed in the preceding account 
* Experiments and Observations on acetous Acid, &c. p. 295. 
f 79 Phil. Trans. 7. 
