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A white amorphous substance, the insoluble part of cherry gum; -- called also meta-arabinic acid.

A nitrogenous substance closely resembling diastase, obtained from bran, and possessing the power of converting starch into dextrin, sugar, and lactic acid. Watts.

Like the brain in form or substance.

A nonphosphorized, nitrogenous substance, obtained from brain and nerve tissue by extraction with boiling alcohol. It is uncertain whether it exists as such in nerve tissue, or is a product of the decomposition of some more complex substance.

Cerium oxide, CeO2, a white infusible substance constituting about one per cent of the material of the common incandescent mantle.

A waxy substance extracted by alcohol or ether from cork; sometimes applied also to the portion of beeswax which is soluble in alcohol. Watts.

A waxy substance obtained from the bark of the sugar cane, and crystallizing in delicate white laminæ.

A white crystalline substance, C27H55.OH, obtained from Chinese wax, and regarded as an alcohol of the marsh gas series; -- called also cerotic alcohol, ceryl alcohol.

A white, waxy substance, forming the essential part of spermaceti.

A white substance extracted from the lichen, Iceland moss (Cetraria Islandica). It consists of several ingredients, among which is cetraric acid, a white, crystalline, bitter substance.

A spiral band of thickened albuminous substance which exists in the white of the bird's egg, and serves to maintain the yolk in its position; the treadle.

A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as common limestone.

Impure carbon prepared from vegetable or animal substances; esp., coal made by charring wood in a kiln, retort, etc., from which air is excluded. It is used for fuel and in various mechanical, artistic, and chemical processes.

m the celandine, and named from the red color of its salts, It is a coloriess crystalline substance, and acts as an acrid narcotic poison. It is identical with sanguinarine.

cid, a weak acid extracted fron the celandine (Chelidonium majus), as a white crystalline substance.

A substance used for producing a chemical effect; a reagent.

The force exerted between the atoms of elementary substance whereby they unite to form chemical compounds; chemical attaction; affinity; -- sometimes used as a general expression for chemical activity or relationship.

That branch of science which treats of the composition of substances, and of the changes which they undergo in consequence of alterations in the constitution of the molecules, which depend upon variations of the number, kind, or mode of arrangement, of the constituent atoms. These atoms are not assumed to be indivisibl…

A term sometimes applied to the decomposition of organic substance into more simple bodies, by the use of chemical agents alone. Thudichum.

bited by small free-swimming organisms, as bacteria, zoöspores of algæ, etc., to chemical substances held in solution. They may be attracted (positive chemotaxis) or repelled (negative chemotaxis). -- Chem`o*tac"tic (#), a. -- Chem`o*tac"tic*al*ly, adv.