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cause to become visible, as an invisible or latent image upon plate, by submitting it to chemical agents; to bring to view. To develop a curved surface on a place (Geom.), to produce on the plane an equivalent surface, as if by rolling the curved surface so that all parts shall successively touch the plane.…

Capable of transmitting the chemical or actinic rays of light; as, diactinic media.

The instrument or medium used to effect chemical dialysis.

h reactions or processes that diazo compounds, or their derivatives, shall be produced by chemical exchange or substitution.

eat and moisture; to expose to a gentle heat in a boiler or matrass, as a preparation for chemical operations.

Crystallization in two independent forms of the same chemical compound, as of calcium carbonate as calcite and aragonite.

Crystallizing under two forms fundamentally different, while having the same chemical composition.

from certain allyl derivatives. Though isomeric with benzine, it is very different in its chemical relations. Called also dipropinyl.

s the reverse of assimilation; downward metabolism. The breaking down of already existing chemical compounds into simpler ones, sometimes called disassimilation. Martin.

Change of form by chemical agency; decomposition; resolution. The dissolution of the compound. South.

Capable of being distilled; especially, capable of being distilled without chemical change or decomposition; as, alcohol is distillable; olive oil is not distillable.

or mineral substance used in the composition of medicines; any stuff used in dyeing or in chemical operations. Whence merchants bring Their spicy drugs. Milton.

ist of two distinct constituents, themselves simple or complex, and possessed of opposite chemical or electrical affinities.

To become covered with a whitish crust or light crystallization, from a slow chemical change between some of the ingredients of the matter covered and an acid proceeding commonly from an external source; as, the walls of limestone caverns sometimes effloresce with nitrate of calcium in consequence of the action in cons…

A nitrogenous substance, somewhat resembling albumin, which forms the chemical basis of elastic tissue. It is very insoluble in most fluids, but is gradually dissolved when digested with either pepsin or trypsin.

r tension when the circuit is broken; and by producing heat, light, concussion, and often chemical changes when the circuit passes between the poles or through any imperfectly conducting substance or space. It is generally brought into action by any disturbance of molecular equilibrium, whether from a chemical, physica…

That branch of science which treats of the relation of electricity to chemical changes.

The act or art precipitating a metal electro-chemical action, by which a coating is deposited, on a prepared surface, as in electroplating and electrotyping; galvanoplasty.

The act or process of chemical decomposition, by the action of electricity; as, the electrolysis of silver or nickel for plating; the electrolysis of water.

ed or unformed ferment, in distinction from an organized or living ferment; a soluble, or chemical, ferment. Ptyalin, pepsin, diastase, and rennet are good examples of enzymes.