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The chemical basis of sponge tissue, a nitrogenous, hornlike substance which on decomposition with sulphuric acid yields leucin and glycocoll.

neous combustion, combustion produced in a substance by the evolution of heat through the chemical action of its own elements; as, the spontaneous combustion of waste matter saturated with oil. -- Spontaneous generation. (Biol.) See under Generation.

To color, as wood, glass, paper, cloth, or the like, by processess affecting, chemically or otherwise, the material itself; to tinge with a color or colors combining with, or penetrating, the substance; to dye; as, to stain wood with acids, colored washes, paint rubbed in, etc.; to stain glass.

lly increases the hardness, or raises the melting point, of the fat, as in mutton tallow. Chemically, it is a compound of glyceryl with three molecules of stearic acid, and hence is technically called tristearin, or glyceryl tristearate.

f calculating the atomic proportions, combining weights, and other numerical relations of chemical elements and their compounds.

A hypothetical component of a chemical atom, on the theory that the elements themselves are complex substances; -- called also atomicule.

ng, etc., and in general its manufacture is the most important and fundamental of all the chemical industries. Formerly called vitriolic acid, and now popularly vitriol, and oil of vitriol. -- Fuming sulphuric acid, or Nordhausen sulphuric acid. See Disulphuric acid, under Disulphuric. -- Sulphuric anhydride, sulphur…

ove or beyond physics; not explainable by physical laws. Something superphysical and superchemical. J. Le Conte.

To support in a liquid, as an insoluble powder, by stirring, to facilitate chemical action. To suspend payment (Com.), to cease paying debts or obligations; to fail; -- said of a merchant, a bank, etc.

A compressed portion of one or more drugs or chemicals, or of food, etc.

ed prisms, and is especially characterized by containing both nitrogen and sulphur, being chemically amido- isethionic acid, C

y physical processes, as by the theurgic operations of some ancient Platonists, or by the chemical processes of the German fire philosophers; also, a direct, as distinguished from a revealed, knowledge of God, supposed to be attained by extraordinary illumination; especially, a direct insight into the processes of the…

That branch of chemical science which includes the investigation of the various relations existing between chemical action and that manifestation of force termed heat, or the determination of the heat evolved by, or employed in, chemical actions.

or violet dyestuff having a greenish metallic luster. It is produced artificially, by the chemical dehydration of thionine, as a brown amorphous powder.

Of, pertaining to, or denoting, those rays of light which produce chemical effects; actinic. [R.]

Of, relating to, or produced by, the chemical action of rays of light; photographic.

To bring, as a print, to a certain required shade of color, as by chemical treatment. To tone down. (a) To cause to give lower tone or sound; to give a lower tone to. (b) (Paint.) To modify, as color, by making it less brilliant or less crude; to modify, as a composition of color, by making it more harmonius. Its thous…

An alkaloid, C8H13N, obtained by the chemical dehydration of tropine, as an oily liquid having a coninelike odor.

d a bitterish, slightly acrid taste. It is used for a dye, a medicine, a condiment, and a chemical test.

pancreatic digestion, by putrefaction as of cheese, by the action of boiling acids, etc. Chemically, it consists of oxyphenol and amidopropionic acid, and by decomposition yields oxybenzoic acid, or some other benzol derivative. [Written also tyrosine.]