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ologous with crotonic acid, and obtained from croton oil (from Croton Tiglium) as a white crystalline substance.

ntary substance found as an oxide in the mineral cassiterite, and reduced as a soft white crystalline metal, malleable at ordinary temperatures, but brittle when heated. It is not easily oxidized in the air, and is used chiefly to coat iron to protect it from rusting, in the form of tin foil with mercury to form the re…

lated both to the acetylene and the aromatic series, and produced artificially as a white crystalline substance; -- called also diphenyl acetylene.

H3.C6H4.CO2H, which are related to toluene and analogous to benzoic acids. They are white crystalline substances, and are called respectively orthotoluic acid, metatoluic acid, and paratoluic acid.

A complex double tolyl and toluidine derivative of glycocoll, obtained as a white crystalline substance.

atoluidine; especially, the commonest one, or paratoluidine, which is obtained as a white crystalline substance.

Of, pertaining to, or designating, any one of three isomeric crystalline acids, C9H10ON.CO2H, which are toluyl derivatives of glycocoll.

A white concretionary form of calcium carbonate, usually hard and semicrystalline. It is deposited from the water of springs or streams holding lime in solution. Extensive deposits exist at Tivoli, near Rome.

A colorless crystalline substance prepared by the reaction of carbolic acid with bromine.

urring naturally in unripe beet roots, and produced artificially from glycerin as a white crystalline substance.

, or designating, that acid of the fatty acids heterologous with tridecane. It is a white crystalline substance.

4H7N3O2, obtained, by the action of the vapor of cyanic acid on cold aldehyde, as a white crystalline substance having a slightly acid taste and faint smell; -- called also ethidene- or ethylidene-biuret.

C6H3.(CO2)3, of the aromatic series, obtained, by the oxidation of mesitylene, as a white crystalline substance. [Written also trimesic.]

mbination of neutral and acid sodium carbonate, Na2CO3.2HNaCO3.2H2O, occurring as a white crystalline fibrous deposit from certain soda brine springs and lakes; -- called also urao, and by the ancients nitrum.

o, or designating, an acid obtained from atropine and certain other alkaloids, as a white crystalline substance slightly soluble in water.

A white crystalline alkaloid, C8H15NO, produced by decomposing atropine.

A white crystalline nitrogenous substance present in small amount in the pancreas and spleen, and formed in large quantity from the decomposition of proteid matter by various means, -- as by pancreatic digestion, by putrefaction as of cheese, by the action of boiling acids, etc. Chemically, it consists of oxyphenol and…

A mineral occurring in white rounded crystalline masses. It is a hydrous borate of lime and soda.

A tasteless white crystalline substance, C9H6O3, found in the bark of a certain plant (Daphne Mezereum), and also obtained by the distillation of certain gums from the Umbelliferæ, as galbanum, asafetida, etc. It is analogous to coumarin. Called also hydroxy- coumarin.

H18O2, of the propiolic acid series, obtained indirectly from undecylenic acid as a white crystalline substance.