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A colorless, crystalline, organic base, obtained from rosaniline by reduction, and also from other sources. It forms colorless salts.

A white, crystalline, nitrogenous substance formed in the decomposition of albuminous matter by pancreatic digestion, by the action of boiling dilute sulphuric acid, and by putrefaction. It is also found as a constituent of various tissues and organs, as the spleen, pancreas, etc., and likewise in the vegetable kingdom…

A mineral having a glassy fracture, occurring in translucent trapezohedral crystals. It is a silicate of alumina and potash. It is found in the volcanic rocks of Italy, especially at Vesuvius.

g the plane of polarization towards the left; levogyrate, as levulose, left handed quartz crystals, etc. [Written also lævorotatory.]

A sirupy variety of sugar, rarely obtained crystallized, occurring widely in honey, ripe fruits, etc., and hence called also fruit sugar. It is called levulose, because it rotates the plane of polarization to the left. [Written also lævulose.]C6H12O6.

A mineral of an olive-green color, commonly in orthorhombic crystals. It is a hydrous phosphate of copper.

r principle found in the bark of the privet (Ligustrum vulgare), and extracted as a white crystalline substance with a warm, bitter taste; -- called also ligustron.

s contains also magnesium carbonate, and is then called magnesian or dolomitic limestone. Crystalline limestone is called marble.

A bitter, white, crystalline substance found in orange and lemon seeds.

A hydrous sulphate of lead and copper occurring in bright blue monoclinic crystals.

A mineral of pale steel-gray color and metallic luster, occurring in isometric crystals, and also massive. It is a sulphide of cobalt containing some nickel or copper.

A hydrated arseniate of copper, occurring in obtuse pyramidal crystals of a sky-blue or verdigris-green color.

Lead monoxide; a yellowish red substance, obtained as an amorphous powder, or crystallized in fine scales, by heating lead moderately in a current of air or by calcining lead nitrate or carbonate. It is used in making flint glass, in glazing earthenware, in making red lead minium, etc. Called also massicot.…

Crystallized litharge, obtained by fusion in the form of fine yellow scales.

Pertaining to, or designating, a crystalline, organic acid, resembling cholic acid, found in the biliary intestinal concretions (bezoar stones) common in certain species of antelope.

matoxylon Campechianum), a native of South America, It is a red, heavy wood, containing a crystalline substance called hæmatoxylin, and is used largely in dyeing. An extract from this wood is used in medicine as an astringent. Also called Campeachy wood, and bloodwood.

A kind of crystallite having a (slender) acicular form.

f amarine, and regarded as a derivative of benzoic aldehyde. It is obtained in long white crystalline tufts, -- whence its name.

A mineral occurring in small, green, transparent, monoclinic crystals. It is a hydrous phosphate of iron.

A kind of watch crystal which is more than ordinarily flattened in the center; also, a species of convexoconcave lens for spectacles.