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loid extracted from the curare poison and from the Strychnos toxifera. It is obtained in crystalline colorless salts.

The coloring principle of turmeric, or curcuma root, extracted as an orange yellow crystalline substance, C14H14O4, with a green fluorescence.

A salt of cyanic acid. Ammonium cyanate (Chem.), a remarkable white crystalline substance, NH4.O.CN, which passes, on standing, to the organic compound, urea, CO.(NH)2.

A mineral occuring in thin-bladed crystals and crystalline aggregates, of a sky-blue color. It is a silicate of aluminium. [Written also kyanite.]

r urea, and called pyrouric acid; afterwards obtained from isocyanic acid. It is a white crystalline substance, odorless and almost tasteless; -- called also tricarbimide.

See Chrysoberyl.

A white crystalline substance, C3H7NSO2, containing sulphur, occuring as a constituent of certain rare urinary calculi, and occasionally found as a sediment in urine.

The whiteweed (Chrysanthemum Leucanthemum), the plant commonly called daisy in North America; -- called also oxeye daisy. See Whiteweed.

A white crystalline, sugary substance obtained from an African caotchouc.

A crystalline vari ety of fruit sugar obtained from dambonite.

A mineral occuring in octahedral crystals, also massive, of a reddish color. It is a silicate of iron, zinc manganese, and glicinum, containing sulphur.

A colorless crystalline substance, C9H6O4, extracted from daphnin.

A white, crystalline, bitter substance, regarded as a glucoside, and extracted from Daphne mezereum and D. alpina.

A white crystalline glucoside extracted from the bastard hemp (Datisca cannabina).

A borosilicate of lime commonly occuring in glassy,, greenish crystals. [Written also datholite.]

bsorbing moisture from the air, as certain salts, acids, and alkalies. In very moist air crystals of strontites deliquesce. Black.

duced by a foreign mineral, usually an oxide of manganese, as in the moss agate; also, a crystallized mineral having an arborescent form, e. g., gold or silver; an arborization.

Pertaining to a dendrite, or to arborescent crystallization; having a form resembling a shrub or tree; arborescent.

rization of light (Opt.), a change in the plane of polarization of rays, especially by a crystalline medium, such that the light which had been extinguished by the analyzer reappears as if the polarization had been anulled. The word is inappropriate, as the ray does not return to the unpolarized condition.…

Same as Stilbite. It commonly occurs in bundles or tufts of crystals.