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markable than those of azote; probably,in consequence of its greater capacity forheat, and probably, likewise, of a higherconducting power connected with its greaterdensity.

In exploding a mixture of 1 part of gasfrom the distillation of coal, and 8 parts ofair in a tube of a quarter of an inch indiameter and a foot long, more than asecond was required before the flamereached from one end of the tube to theother ; and I could not make any mixtureexplode in a glass tube one-seventh of aninch in diameter ; and this gas was moreinflammable than the fire-damp, as it con-sisted of carburetted hydrogene gas mixedwith some olefiant gas.

In exploding mixtures of fire-damp andair in a jar connected with the atmosphereby an aperture of half an inch, and connectedwith a bladder by a stopcock, having an aper-ture of about one-sixth of an inch,* I found

* Since these experiments were made, Dr. Wol-iASTON has informed me, that Mr. Tennant hadobserved some time ago, that mixtures of the gas fromthe distillation of coal and air, would not explodein very small tubes.