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- said of those compounds of gold in which this element has its lower valence; as, aurous oxide.

Self-catalysis; catalysis of a substance by one of its own products, as of silver oxide by the silver formed by reduction of a small portion of it. -- Au`to*cat`a*lyt"ic (#), a.

Of or pertaining to barium; as, baric oxide.

rature. It is difficult to obtain the pure metal, from the facility with which it becomes oxidized in the air. Atomic weight,

An oxide of barium (or barytum); a heavy earth with a specific gravity above 4.

ombined with an acid, neutralizes the latter and forms a salt; -- applied also to the hydroxides of the positive elements or radicals, and to certain organic bodies resembling them in their property of forming salts with acids.

low percentage of silica, as basalt. Basic salt (Chem.), a salt formed from a base or hydroxide by the partial replacement of its hydrogen by a negative or acid element or radical.

The process of washing molten pig iron by adding iron oxide, proposed by I. Lowthian Bell of England about 1875.

A yellowish crystalline substance, C6H5.CO.CO.C6H5, formed from benzoin by the action of oxidizing agents, and consisting of a doubled benzoyl radical.

y, and distinguished by its deep color, which is probably due to the presence of a little oxide of chromium.

A green pigment present in the bile, formed from bilirubin by oxidation.

Indurated clay, when much mixed with the oxide of iron. Kirwan.

Bismuth trioxide, or bismuth ocher.

g to bismuth; containing bismuth, when this element has its higher valence; as, bismuthic oxide.

swampy land; a variety of brown iron ore, or limonite. (b) Bog manganese, the hydrated peroxide of manganese. -- Bog rush (Bot.), any rush growing in bogs; saw grass. -- Bog spavin. See under Spavin.

of several varieties of friable earthy clay, usually colored more or less strongly red by oxide of iron, and used to color and adulterate various substances. It was formerly used in medicine. It is composed essentially of hydrous silicates of alumina, or more rarely of magnesia. See Clay, and Terra alba.…

process for producing upon articles of iron or steel an adherent coating of the magnetic oxide of iron (which is not liable to corrosion by air, moisture, or ordinary acids). This is accomplished by producing, by oxidation at about 1600º F. in a closed space, a coating containing more or less of the ferric oxide (Fe2O…

is white when pure. It is colored intensely red by alkalies on exposure to the air, being oxidized to bra*sil"e*in, C16H12O5, to which brazilwood owes its dyeing properties.

A native oxide of manganese, of dark brownish black color. It was named from a Mr. Braun of Gotha.

A mineral consisting of titanic oxide, and hence identical with rutile and octahedrite in composition, but crystallizing in the orthorhombic system.