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retina, held in solution by fats, and slowly decolorized by light; distinct from the photochemical pigments of the rods of the retina.

Any chemical group or residue (as NO

A chemical vessel consisting of two portions unequally exposed to the heat of the fire, and with connecting pipes or passages, through which the fluid rises from the overheated portion, and descends from the relatively colder, maintaining a circulation.

.), argillaceous schist; argillite. -- Fatty clays, clays having a greasy feel; they are chemical compounds of water, silica, and aluminia, as halloysite, bole, etc. -- Fire clay , a variety of clay, entirely free from lime, iron, or an alkali, and therefore infusible, and used for fire brick. -- Porcelain clay, a v…

uid) to change into a curdlike or semisolid state, not by evaporation but by some kind of chemical reaction; to curdle; as, rennet coagulates milk; heat coagulates the white of an egg.

liquid to a thickened, curdlike, insoluble state, not by evaporation, but by some kind of chemical reaction; as, the spontaneous coagulation of freshly drawn blood; the coagulation of milk by rennet, or acid, and the coagulation of egg albumin by heat. Coagulation is generally the change of an albuminous body into an i…

The chemical basis of ordinary connective tissue, as of tendons or sinews and of bone. On being boiled in water it becomes gelatin or glue.

A method of quantitative chemical analysis based upon the comparison of the depth of color of a solution with that of a standard liquid.

The act or process of uniting by chemical affinity, by which substances unite with each other in definite proportions by weight to form distinct compounds.

her; to bring into harmonious union; to cause or unite so as to form a homogeneous, as by chemical union. So fitly them in pairs thou hast combined. Milton. Friendship is the which really combines mankind. Dr. H. More. And all combined, save what thou must combine By holy marriage. Shak. Earthly sounds, though sweet an…

United closely; confederated; chemically united.

at, and sometimes both light and heat. Combustion results is common cases from the mutual chemical action and reaction of the combustible and the oxygen of the atmosphere, whereby a new compound is formed. Ure. Supporter of combustion (Chem.), a gas as oxygen, the combination of which with a combustible, as coal, const…

A mass or body formed by combining two or more substances; as, a chemical composition. A omposition that looks . . . like marble. Addison.

To purify or refine chemically. [Obs.] Thomson.

To combine or unite (as two chemical substances) with or without separation of some unimportant side products.

has the quality of eating or wearing away gradually. [Corrosives] act either directly, by chemically destroying the part, or indirectly by causing inflammation and gangrene. Dunglison.

arts of; to resolve into original elements; to set free from previously existing forms of chemical combination; to bring to dissolution; to rot or decay.

escence, under Determinate. -- Law of definite proportions (Chem.), the essential law of chemical combination that every definite compound always contains the same elements in the same proportions by weight; and, if two or more elements form more than one compound with each other, the relative proportions of each are…

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.