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the elements which appear at the respective poles when a body is subjected to electro-chemical decomposition. Cf. Anion, Cation.

Any agent by which irritation is produced; as, a chemical irritant; a mechanical or electrical irritant.

A popular name for mica, especially when in thin sheets.

ism (Chem.), the condition or relation of certain (metameric) substances, which, while chemically identical (in that they have the same composition, the same molecular weights, and the same ultimate constitution), are yet physically different, as in their action on polarized light, as dextro- and lævo-tartaric acids. I…

tons, etc. Formerly called also black amber. Jet ant (Zoöl.), a blackish European ant (Formica fuliginosa), which builds its nest of a paperlike material in the trunks of trees.

usterity and be jocose and pleasant with an adversary. Shaftesbury. All . . . jocose or comical airs should be excluded. I. Watts.

ough its beak, feet, and legs resemble those of gallinaceous birds, it is related in anatomical characters to the ducks and geese (Anseres). Called also horned screamer. The name is sometimes applied also to the chaja. See Chaja, and Screamer.

ure of substances, containing sulphur in a loose state of combination, and forming the chemical basis of epidermal tissues, such as horn, hair, feathers, and the like. It is an insoluble substance, and, unlike elastin, is not dissolved even by gastric or pancreatic juice. By decomposition with sulphuric acid it yields…

Characterized by small, detached points, chiefly composed of mica, less decomposable than the mass of the rock, and forming knots in relief on the weathered surface; as, knotted rocks. Percival.

chemist; also, a place devoted to experiments in any branch of natural science; as, a chemical, physical, or biological laboratory. Hence, by extension, a place where something is prepared, or some operation is performed; as, the liver is the laboratory of the bile.

Capable of being split into laminæ or thin plates, as mica; capable of being extended under pressure into a thin plate or strip. When a body can be readily extended in all directions under the hammer, it is said to be malleable; and when into fillets under the rolling press, it is said to be laminable. Ure.…

e in solitude. (b) To desist or refrain from having to do with; as, to leave dangerous chemicals alone. -- To leave off. (a) To desist from; to forbear; to stop; as, to leave off work at six o'clock. (b) To cease wearing or using; to omit to put in the usual position; as, to leave off a garment; to leave off the table…

A species of mica, of a lilac or rose-violet color, containing lithia. It usually occurs in masses consisting of small scales. See Mica.

An iron-potash mica, of a raven-black color, usually found in granitic rocks in small six-sided tables, or as an aggregation of minute opaque scales. See Mica.

sues and organs, as the spleen, pancreas, etc., and likewise in the vegetable kingdom. Chemically it is to be considered as amido-caproic acid. (CH3)2CH.CH2.CH(NH2)-COOH. L-leucine, the natural form, is present in most proteins.

nce characterizing wood cells and differing from cellulose in its conduct with certain chemical reagents.

A bond of affinity, or a unit of valence between atoms; -- applied to a unit of chemical force or attraction.

Logarithmically.

Serving to measure or ascertain chemical equivalents; stoichiometric. [R.]

The science which treats of the chemical properties, actions or relations of substances in quantity; -- distinguished from micro- chemistry.