carbonated hydrogenous Gas. 4,13 
of the repetition of them, viz. the appearance of a deposit from 
the carbonated hydrogenous gas during its electrization, and the 
formation of ammoniac by the same process. In some expe- 
riments, which I made on the first portion of gas, both these 
facts were sufficiently apparent ; but neither of them occurred 
on electrifying the gas which was afterwards procured. Sus- 
pecting that the cessation of them arose from the superior 
purity of the latter portion from azotic gas, I passed the electric 
shock through a mixture of carbonated hydrogen with about 
one-fourth its bulk of azote, and thus again produced the pre- 
cipitate, which would have been of a white colour, if it had not 
been obscured by minute globules of mercury, that were driven 
upwards by the force of the explosion. An infusion of violets 
was tinged green when admitted to the electrified gas ; but the 
change of colour did not occur instantly, as happens from the 
absorption of ammoniacal gas ; and required for its production 
that the liquid should be brought extensively into contact with 
the inner surface of the tube. From this effect on a blue ve- 
getable colour, we may infer that the precipitate was an alka- 
line substance, and probably the carbonate of ammoniac ; but 
the quantity was much too minute to be the subject of more 
decisive experiment. 
I shall conclude this memoir, with a brief summary of the 
facts that are established by the preceding experiments.* 
Those included under the first head are deducible from the 
experiments of Dr. Austin. 
* Since this paper was written 1 have extended the inquiry to phosphorated hydro- 
genous gas, which expands equally with the carbonated hydrogen ; loses its property of 
inflaming when brought into contact with oxygenous gas ; and affords evident traces 
of a production of phosphorous or phosphoric acid. 
3 H 2 
