marsh gas

But it was only the marsh gas escaping with a sound like a low chuckle.

When chlorine is made to act on marsh gas, or when chloral is treated with an alkali, chloroform is also produced.

The reducing agent is alcohol saturated with marsh gas; this is diluted with its own volume of water.

Franklin's study of marsh gas and effect of oil on water, 390.

In summer time, a succession of bubbles—doubtless caused by marsh gas—keep constantly appearing on the surface.

Aluminum carbide yields alumina and methane (marsh gas), another hydro-carbon, the chief constituent of natural gas.

That's really methane, marsh gas, the same stuff that makes the will-o'-the-wisp you can see dancing around over a marsh.

These escape into the air and the spontaneous combustion of the phosphine ignites the marsh gas.

Marsh gas and other inflammable gases commonly rise from such places, and are often ignited by man, or by lightning, etc.

In rock gas, marsh gas itself is actually found in the proportion of about 93 per cent.