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An opacity of the crystalline lens, or of its capsule, which prevents the passage of the rays of light and impairs or destroys the sight.

One of the tannic acids, extracted from catechu as a white, crystaline substance; -- called also catechuic acid, and catechuin.

.), any species of louse infecting cattle. There are several species. The Hæmatatopinus eurysternus and H. vituli are common species which suck blood; Trichodectes scalaris eats the hair. -- Cattle plague, the rinderpest; called also Russian cattle plague. -- Cattle range, or Cattle run, an open space through which c…

trontium sulphate, a mineral so named from its occasional delicate blue color. It occurs crystallized, also in compact massive and fibrous forms.

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.

Native lead carbonate; a mineral occurring in colorless, white, or yellowish transparent crystals, with an adamantine, also massive and compact.

a Islandica). It consists of several ingredients, among which is cetraric acid, a white, crystalline, bitter substance.

Of, pertaining to, or derived from, spermaceti. Cetylic alcohol (Chem.), a white, waxy, crystalline solid, obtained from spermaceti, and regarded as homologous with ordinary, or ethyl, alcohol; ethal; - - called also cetyl alcohol.

A mineral occuring in glassy rhombohedral crystals, varying, in color from white to yellow or red. It is essentially a hydrous silicate of alumina and lime. Called also chabasie.

A cryptocrystalline, translucent variety of quartz, having usually a whitish color, and a luster nearly like wax. [Written also calcedony.]

ore of opper, containing copper, iron, and sulphur. It occurs massive and in tetragonal crystals of a bright brass yellow color.

btained from 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.

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

The mineral azurite, found in fine crystallization at Chessy, near Lyons; called also chessylite.

A variety of feldspar found in crystals in the county of Chester, Pennsylvania.

apperance of a cross section is due to the symmetrical arrangement of impurities in the crystal.

To produce, by sudden cooling, a change of crystallization at or near the surface of, so as to increase the hardness; said of cast iron.

tes, with edible acorns. -- Western Chinquapin, an evergreen shrub or tree (Castanopes chrysophylla) of the Pacific coast. In California it is a shrub; in Oregon a tree 30 to 125 feet high.

Chloral hydrate. Chloral hydrate, a white crystalline substance, obtained by treating chloral with water. It produces sleep when taken internally or hypodermically; -- called also chloral.