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It will be useless to reason upon thisratio as exact, for charcoal was depositedboth from the olefiant gas and coal gasduring the experiment, and much sulphurwas deposited from the sulphuretted hy-drogene ; and there is great reason to believe,that the capacities of fluids for heat increasewith their temperature. 11 confirms, how-ever, the general conclusions, and provesthat hydrogene stands at the head of thescale, and gaseous oxide of carbon at thebottom. It might at first view be imaginedthat, according to this scalp, the flame ofcarbonic oxide ought to be extinguished byrarefaction, at the same degree as that ofcarburetted hydrogene; but it must be re-membered, as I have mentioned in anotherplace, that carbonic oxide is a much morecombustible gas. Carbonic oxide inflamesin the atmosphere when brought into contactwith an iron wire heated to dull redness,whereas carburetted hydrogene is not in-flammable by a similar wire, unless it isheated to whiteness so as to burn with sparks.

new system of Chemical Philosophy ; they agree inshewing that hydrogene produces more heat in combus-tion than any of its compounds.

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