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See under Gas.

It is a product of the incomplete combustion of carbon, and is an abundant constituent of water gas. It is fatal to animal life, extinguishes combustion, and burns with a pale blue flame, forming carbon dioxide.

Saturated or impregnated with some volatile carbon compound; as, water gas is carbureted to increase its illuminating power. [Written also carburetted.] Carbureted hydrogen gas, any one of several gaseous compounds of carbon and hydrogen, some of with make up illuminating gas. -- Light carbureted hydrogen, marsh gas,…

ion of bituminous coal. It is used in making air gas, and in giving illuminating power to water gas. See Carburetor.

metals, as zinc, iron, etc. It is very inflammable, and is an ingredient of coal gas and water gas. It is standard of chemical equivalents or combining weights, and also of valence, being the typical monad. Symbol H. Atomic weight 1.

shell. -- River pirate (Zoöl.), the pike. -- River snail (Zoöl.), any species of fresh-water gastropods of Paludina, Melontho, and allied genera. See Pond snail, under Pond. -- River tortoise (Zoöl.), any one of numerous fresh-water tortoises inhabiting rivers, especially those of the genus Trionyx and allied gener…

A genus of small spiral fresh-water gastropods having an operculum.

Any fresh-water gastropod of the genus Valvata.

biotocoid. -- Viviparous shell (Zoöl.), any one of numerous species of operculated fresh-water gastropods belonging to Viviparus, Melantho, and allied genera. Their young, when born, have a well-developed spiral shell.