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A complex nitrogenous substance, produced as a yellow crystalline substance, and regarded as a complex derivative of barbituric acid.

A yellow crystalline glucoside obtained from the pansy (Viola tricolor), and decomposing into glucose and quercitrin.

ing, a complex nitroso derivative of barbituric acid. It is obtained as a white or yellow crystalline substance, and forms characteristic yellow, blue, and violet salts.

id constituent, and from the seeds of many plants. From the latter it can be separated in crystalline form.

- Red vitriol, a native sulphate of cobalt. -- Vitriol of Mars, ferric sulphate, a white crystalline substance which dissolves in water, forming a red solution. -- White vitriol, zinc sulphate, a white crystalline substance used in medicine and in dyeing. It is usually obtained by dissolving zinc in sulphuric acid, o…

rom, or designating, an acid obtained from a lichen (Cetraria vulpina) as a yellow or red crystalline substance which on decomposition yields pulvinic acid.

East Indian apocynaceous tree (Wrightia antidysenterica), and extracted as a bitter white crystalline substance. It was formerly used as a remedy for diarrhoea. Called also conessine, and neriine.

An amido derivative of xanthic acid obtained as a white crystalline substance, C2H5O.CS.NH2; -- called also xanthogen amide.

A white microcrystalline nitrogenous compound, C5H4O2N4, present in muscle tissue, in the liver, spleen, pancreas, and other organs, and also in urine (in small quantities) and some urinary calculi, and in the juices of certain plants; -- so called because it leaves a yellow residue when evaporated to dryness with nitr…

alkaloids found in the root of the yellow puccoon (Hydrastis Canadensis). It is a yellow crystalline substance, and resembles berberine.

A glucoside extracted from Persian berries as a yellow crystalline powder, used as a dyestuff.

An acid amide derivative of xylic acid, obtained as a white crystalline substance.

Any one of six metameric phenol derivatives of xylene, obtained as crystalline substances, (CH3)2.C6H3.OH.

ining to, or designating, a complex acid related to mesitylenic acid, obtained as a white crystalline substance by the action of sodium and carbon dioxide on crude xylenol.

.C6H3.NH2, resembling aniline, and related to xylene. They are liquids, or easily fusible crystalline substances, of which three are derived from metaxylene, two from orthoxylene, and one from paraxylene. They are called the amido xylenes.

d respectively by the oxidation of certain xylidine compounds. In general they are yellow crystalline substances.

A derivative of xylene obtained as a white crystalline substance which on exposure in the air becomes red; -- called also betaorcin.

rries of a species of honeysuckle (Lonicera xylosteum), and extracted as a bitter, white, crystalline substance.

nonmetals, obtained from the mineral zircon as a dark sooty powder, or as a gray metallic crystalline substance. Symbol Zr. Atomic weight, 90.4.