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A solid hydrocarbon, C6H4.C2H2.C6H4, which accompanies naphthalene in the last stages of the distillation of coal tar. Its chief use is in the artificial production of alizarin. [Written also anthracin.]

h it burns with a nearly non luminous flame. The purer specimens consist almost wholly of carbon. Also called glance coal and blind coal.

An instrument for measuring the amount of carbonic acid in a mixture.

A hydrocarbon, C6H4.C2O2.C6H4, subliming in shining yellow needles. It is obtained by oxidation of anthracene.

A mineral identical in composition with calcite or carbonate of lime, but differing from it in its crystalline form and some of its physical characters.

An extinct genus of Bryzoa characteristic of the subcarboniferous rocks. Its form is that of a screw.

A siliceous variety of calcite, or carbonate of lime, having a silvery-white, pearly luster, and a waving or curved lamellar structure.

etc., many of which have an aromatic odor. They include many of the most important of the carbon compounds and may all be derived from the benzene group, C6H6. The term is extended also to many of their derivatives. -- Aromatic vinegar. See under Vinegar.

blood into arterial blood during its passage through the lungs, oxygen being absorbed and carbonic acid evolved; -- called also aëration and hematosis.

g powder or dynamite composed of nitroglycerin, wood fiber, sodium nitrate, and magnesium carbonate.

A hydrous carbonate of copper and zinc, found in pale green or blue crystalline aggregations. It yields a kind of brass on reduction.

Now especially applied to compounds containing a two atom nitrogen group uniting two hydrocarbon radicals, as in azobenzene, azobenzoic, etc. These compounds furnish many artificial dyes. See Diazo-.

zed by a five- membered ring which contains an atom of nitrogen and at least one other noncarbon atom (nitrogen, oxygen, sulphur). The prefixes furo-, thio, and pyrro-are used to distinguish three subclasses of azoles, which may be regarded as derived respectively from furfuran, thiophene, and pyrrol by replacement of…

Blue carbonate of copper; blue malachite.

back of the hand, caused by the irritating properties of yeast. -- Baker's salt, the subcarbonate of ammonia, sometimes used instead of soda, in making bread.

baking of bread. Baking powder, a substitute for yeast, usually consisting of an acid, a carbonate, and a little farinaceous matter.

The alkali produced from the plant, being an impure carbonate of soda, used for making soap, glass, etc., and for bleaching purposes.

eral of a white or gray color, occurring massive or crystallized. It is a compound of the carbonates of barium and calcium.

troleum. Benzene nucleus, Benzene ring (Chem.), a closed chain or ring, consisting of six carbon atoms, each with one hydrogen atom attached, regarded as the type from which the aromatic compounds are derived. This ring formula is provisionally accepted as representing the probable constitution of the benzene molecule,…

A liquid consisting mainly of the lighter and more volatile hydrocarbons of petroleum or kerosene oil, used as a solvent and for cleansing soiled fabrics; -- called also petroleum spirit, petroleum benzine. Varieties or similar products are gasoline, naphtha, rhigolene, ligroin, etc.