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hate their inflammation prevented by lessthan three times their volume of oxygene.

A \vax taper was instantly extinguishedin air mixed with one-tenth of silicatedfluoric acid gas, and in air mixed with one-feixth of mdriatic acid gas; but the flame ofhydrogene burned readily in those mixtures,and in mixtures in which the flame of hy-drogene was extinguished, the flame ofsulphur burned.

There is a very simple experiment whichdemonstrates in an elegant manner this ge-neral principle. Into a long bottle with a nar-row neck introduce a lighted taper, and let itbarn till it is extinguished; carefully stop thebottle, and introduce another lighted taper,it will be extinguished before it reaches thebottom of the neck : then introduce a smalltube containing zinc and diluted sulphuricacid, and at the aperture of which the hy-drogene is inflamed; the hydrogene will befound to burn in whatever part of the bottlethe tube is placed: after the hydrogene isextinguished, introduce lighted sulphur;this will burn for some time, and after itsextinction, phosphorus will be as luminousas in the air, and, if heated in the bottle, will