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orbing a portion of the rays. It is characterized by dark spaces, bands, or lines. -- Chemical spectrum, a spectrum of rays considered solely with reference to their chemical effects, as in photography. These, in the usual photogrophic methods, have their maximum influence at and beyond the violet rays, but are not li…

in which the heavenly bodies appear to have their places, and on which the various astronomical circles, as of right ascension and declination, the equator, ecliptic, etc., are conceived to be drawn; an ideal geometrical sphere, with the astronomical and geographical circles in their proper positions on it.…

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

us 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.

hief one used for itinerary distances, also adopted by the Romans for nautical and astronomical measurements. It was equal to 600 Greek or 625 Roman feet, or 125 Roman paces, or to 606 feet 9 inches English. This was also called the Olympic stadium, as being the exact length of the foot-race course at Olympia. Dr. W. S…

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.

mbling a cross. It is a silicate of aluminia and iron, and is generally found imbedded in mica schist. Called also granatite, and grenatite.

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.

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

Loganiaceæ, as from the seeds of the St. Ignatius bean (Strychnos Ignatia) and from nux vomica. It is obtained as a white crystalline substance, having a very bitter acrid taste, and is employed in medicine (chiefly in the form of the sulphate) as a powerful neurotic stimulant. Called also strychnia, and formerly stryc…

A genus of tropical trees and shrubs of the order Loganiaceæ. See Nux vomica.

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

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 tr…

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.

sed of orthoclase and hornblende, the latter often replaced or accompanied by pyroxene or mica. Syenite sometimes contains nephelite (elæolite) or leucite, and is then called nephelite (elæolite) syenite or leucite syenite.

The act of syncopating; a peculiar figure of rhythm, or rhythmical alteration, which consists in welding into one tone the second half of one beat with the first half of the beat which follows.

Pertaining to the system of the world; cosmical. These ends may be called cosmical, or systematical. Boyle.

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

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