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ence called olefiant gas. Called also ethene, elayl, and formerly, bicarbureted hydrogen. Ethylene series (Chem.), the series if unsaturated hydrocarbons of which ethylene is the type, and represented by the general formula CnH2n.

ut regarded as an essential residue and component of certain derivatives of methane; as, methylene bromide, CH2Br2; -- formerly called also methene. Methylene blue (Chem.), an artificial dyestuff consisting of a complex sulphur derivative of diphenyl amine; -- called also pure blue.

Formic aldehyde, regarded as a methylene derivative.

cleus of a large number of derivatives; -- so named because regarded as composed of five methylene residues. Cf. Trimethylene, and Tetramethylene.

A hypothetical hydrocarbon, C4H8, analogous to trimethylene, and regarded as the base of well-known series or derivatives.

A gaseous hydrocarbon, C3H6, isomeric with propylene and obtained from it indirectly. It is the base of a series of compounds analogous to the aromatic hydrocarbons.

nd other derivatives of the paraffin hydrocarbons, but also unsaturated compounds, as the ethylene and acetylene series.

One of a group of metameric hydrocarbons, C5H10, of the ethylene series. The colorless, volatile, mobile liquid commonly called amylene is a mixture of different members of the group.

A solution of silver phosphate in an aqueous solution of ethylene diamine, used as an antiseptic astringent and as a disinfectant.

Any one of three metameric hydrocarbons, C4H8, of the ethylene series. They are gaseous or easily liquefiable.

A sirupy, nontoxic ptomaine, C5H14N2 (chemically pentamethylene diamine), formed in putrefaction of flesh, etc.

An oily hydrocarbon, C16H32, of the ethylene series, obtained from spermaceti.

ence of five, or the next to its highest; as, chloric acid, HClO3. Chloric ether (Chem.), ethylene dichloride. See Dutch liquid, under Dutch.

substance, C3H4(CO2H)2, obtained by distillation of citric acid. It is a compound of the ethylene series.

om croton oil. Crotonic acid (Chem.), a white crystalline organic acid, C3H5.CO2H, of the ethylene, or acrylic acid series. It was so named because formerly supposed to exist in croton oil. Also, any acid metameric with crotonic acid proper.

One of the higher hydrocarbons, C10H20, of the ethylene series.

A liquid hydrocarbon, C10H20, of the ethylene series, regarded as a polymeric form of amylene.

, of a sweetish taste and a pleasant ethereal odor, produced by the union of chlorine and ethylene or olefiant gas; -- called also Dutch oil. It is so called because discovered (in 1795) by an association of four Hollandish chemists. See Ethylene, and Olefiant. -- Dutch oven, a tin screen for baking before an open fir…

Olefiant gas or ethylene; -- so called by Berzelius from its forming an oil combining with chlorine. [Written also elayle.] See Ethylene.

Ethylene; olefiant gas.