Solutions for Galvanic Batteries

See Acids, Mixed, for Galvanic Batteries.

Gannal's Solution

See Anatomical Injections.

Ganteine

(A composition for cleaning kid gloves; sometimes improperly termed Saponine). Dissolve 3 oz. of soap by heat in 2 oz. of water, and when nearly cold add 2 oz. of eau de Javelle, and 1 dr. of water of ammonia; form a paste, which is to be rubbed over the glove with flannel till sufficiently clean.

Garancine

Madder (sometimes the spent madder of the dyer's bath) is mixed with its weight of oil of vitriol, added very gradually, so as to avoid overheating. The acid is then washed out.

Garrot's Covering for Pills

Soak 1 oz. of Purified gelatin in 2 or 3 drs. of water; keep it liquefied in a saltwater bath. The pills are stuck on long pins, and dipped in the solution; when cold the pins are withdrawn, after being heated by a small flame, which melts the gelatin and closes the hole.

Ammoniacal Gas

This is obtained by mixing equal weights of slaked lime (previously cooled) and powdered sal ammoniac, and heating the mixture in a retort or flask. As water rapidly absorbs the gas, it must be collected over mercury, or in a dry bottle as described above.

Carbonic Acid Gas

Carbonic Anhydride. This is obtained

* Whenever practicable india-rubber tubing is now largely employed in place of tubes of glass and metal. by acting on marble or chalk, or carbonate of soda or potash, by a diluted acid. For exact experiments it must be collected over mercury; otherwise it may be collected in a bottle (as above). Mr. Benson states that a saturated solution of sulphate of magnesia may be used in collecting this gas, instead of mercury. See Pocket Formulary.

Carbonic Oxide is obtained by acting on binoxalate of potash with 6 times its weight of oil of vitriol at a gentle heat; or by strongly heating, in an iron bottle or gun-barrel, equal weights of chalk and iron filings. The gas must be passed through water containing lime or caustic potash to absorb the carbonic acid gas.

Chlorine

This gas may be obtained from oxide of manganese, common salt, and sulphuric acid, as directed in making chloride of lime. Or from hydrochloric acid and oxide of manganese (see Chlorinium, Pocket Formulary). But more conveniently, on the small scale, by dissolving common salt in water, adding a sixth of its weight of nitric acid, and as much oxide of manganese. Apply a gentle heat, and the gas is abundantly produced without violent action. (Chemist, vol. i.)

Hydrochloric Acid Gas

It may be obtained by heating together in a flask equal weights of salt and oil of vitriol; or simply by heating strong hydrochloric acid. It must be collected over mercury; or otherwise conducted to the bottom of a dry bottle, as described above.

Hydrogen Gas is readily procured by pouring on fragments of zinc, in a glass bottle, or flask with a bent tube, or retort, some diluted sulphuric acid (1 measure of strong acid to 5 of water). It may be collected over water. If zinc be not at hand, fine iron wire, or the turnings or filings of iron, may be substituted for it. To procure gas of great purity, distilled zinc must be used.