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incipal ore of lead. It is of a bluish gray color and metallic luster, and is cubic in crystallization and cleavage. False galena. See Blende.

A red crystalline dyestuff, obtained by heating together pyrogallic and phthalic acids.

found in the free state in galls, tea, etc., and produced artificially. It is a white, crystalline substance, C6H2(HO)3.CO2H, with an astringent taste, and is a strong reducing agent, as employed in photography. It is usually prepared from tannin, and both give a dark color with iron salts, forming tannate and gallate…

having many varieties differing in color and in their constituents, but with the same crystallization (isometric), and conforming to the same general chemical formula. The commonest color is red, the luster is vitreous, and the hardness greater than that of quartz. The dodecahedron and trapezohedron are the common for…

aloid obtained from the yellow jasmine (Gelsemium sempervirens), as a bitter white semicrystalline substance; -- called also gelsemia.

erived from, the yellow jasmine (Gelsemium sempervirens); as, gelseminic acid, a white crystalline substance resembling esculin.

A bitter, crystallizable substance obtained from gentian.

A crystallizable, sugarlike substance, with a slightly sweetish taste, obtained from the gentian.

A bitter, yellow, crystalline substance, regarded as a glucoside, and obtained from the gentian.

A tasteless, yellow, crystalline substance, obtained from the gentian; -- called also gentianin.

Offspring; progeny; as, the get of a stallion.

phoric or acetic acids. Glacial acid (Chem.), an acid of such strength or purity as to crystallize at an ordinary temperature, in an icelike form; as acetic or carbolic acid. -- Glacial drift (Geol.), earth and rocks which have been transported by moving ice, land ice, or icebergs; bowlder drift. -- Glacial epoch or…

Sulphate of soda, a well-known cathartic. It is a white crystalline substance, with a cooling, slightly bitter taste, and is commonly called "salts."

An alkaloid obtained from the plant Glaucium, as a bitter, white, crystalline substance.

mineral of a dark bluish color, related to amphibole. It is characteristic of certain crystalline rocks.

a ease, etc.) with glass. Two cabinets daintily paved, richly handed, and glazed with crystalline glass. Bacon.

e red blood corpuscles united with hæmatin to form hæmoglobin. It is also found in the crystalline lens of the eye, and in blood serum, and is sometimes called crystallin. In the plural the word is applied to a group of proteid substances such as vitellin, myosin, fibrinogen, etc., all insoluble in water, but soluble i…

A rudimentary form of crystallite, spherical in shape.

The trade name of a sirup, obtained as an uncrystallizable reside in the manufacture of glucose proper, and containing, in addition to some dextrose or glucose, also maltose, dextrin, etc. It is used as a cheap adulterant of sirups, beers, etc.

One of a large series of amorphous or crystalline substances, occurring very widely distributed in plants, rarely in animals, and regarded as influental agents in the formation and disposition of the sugars. They are frequently of a bitter taste, but, by the action of ferments, or of dilute acids and alkalies, always b…