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originally composed of the juices of several plants (whence its name), but now made of an oxide of lead and oil, and consisting essentially of glycerin mixed with lead salts of the fat acids.

To deprive of oxygen; to deoxidize. [R.]

Deoxidation. [R.]

Applied to an acid having in each molecule two atoms of sulphur in the higher state of oxidation. Disulphuric acid, a thick oily liquid, H2S2O7, called also Nordhausen acid (from Nordhausen in the Harts, where it was originally manufactured), fuming sulphuric acid, and especially pyrosulphuric acid. See under Pyrosulph…

of rapidly becoming dry. Drying oil, an oil which, either naturally or after boiling with oxide of lead, absorbs oxygen from the air and dries up rapidly. Drying oils are used as the bases of many paints and varnishes.

Any earthy-looking metallic oxide, as alumina, glucina, zirconia, yttria, and thoria.

em.), a white crystalline substance, C14H8O9, found in bezoar stones, and obtained by the oxidation of gallic acid.

ar, massive, columnar, and in monoclinic crystals. It is a silicate of alumina, lime, and oxide of iron, or manganese.

the equivalents of hydrogen and oxygen in water are respectively 1 and 8, and in hydric dioxide 1 and 16.

tomic weight 165.9. Its salts are rose-colored and give characteristic spectra. Its sesquioxide is called erbia.

A gradual oxidation from exposure to air and moisture, as in the decay of old trees or of dead animals.

A red substance formed by the oxidation of tyrosin.

fats, resins, and pyroxylin, but finds its chief use as an anæsthetic. Called also ethyl oxide.ethyl ether.

ive of ethylsulphuric and sulphuric (thionic) acids, obtained by the action of sulphur trioxide on absolute alcohol.

ack or very dark color. [Written also Æthiops.] [Obs.] Ethiops martial (Old Chem.), black oxide of iron. -- Ethiops mineral (Old Chem.), black sulphide of mercury, obtained by triturating mercury with sulphur. -- Ethiops per se (Old Chem.), mercury in finely divided state, having the appearance of a dark powder, obta…

from potassium chlorate and hydrochloric acid. It is supposed to consist of chlorine tetroxide with some free chlorine.

A yellow, crystalline substance, resembling aurin, and obtained by the oxidation of pittacal; -- called also eupittonic acid. [Written also eupitton.]

tion of human thought and faith. C. Kingsley. Acetous, or Acetic, fermentation, a form of oxidation in which alcohol is converted into vinegar or acetic acid by the agency of a specific fungus or ferment (Mycoderma aceti). The process involves two distinct reactions, in which the oxygen of the air is essential. An inte…

se compounds in which iron has a higher valence than in the ferrous compounds; as, ferric oxide; ferric acid. Ferric acid (Chem.), an acid, H2FeO4, which is not known in the free state, but forms definite salts, analogous to the chromates and sulphates. -- Ferric oxide (Chem.), sesquioxide of iron, Fe2O3; hematite. Se…

Stable; non-volatile. Fixed air (Old Chem.), carbonic acid or carbon dioxide; -- so called by Dr. Black because it can be absorbed or fixed by strong bases. See Carbonic acid, under Carbonic. -- Fixed alkali (Old Chem.), a non-volatile base, as soda, or potash, in distinction from the volatile alkali ammonia. -- Fixe…