1C2

GEOF

Gascoigne Powder. See Pulvis CretjE Compositus.

Gastric Acid is a term applied by some chemists to the gastric juice,but others have found that when an acid is present it consists ofmuriatic and some of the vegetable acids.

Gayacinb. A substance procured from Guaiac bark, somewhat re-sembling the resins, but differs from them by dissolving in nitricacid and forming oxalic acid.

Gelatine. Preparations made with almonds, hartshorn, quinces, Ice-land moss, &c. See Jelly.

Gelatin. An animal product, without smell, soluble in hot water,from which it is precipitated by alcohol: it is also soluble in acidsand alkalies, and unites with tannin.

Genista. Petty Broom. Genista linctoria. Has lately been given indecoction, after cauterizing the sublingual pustules in hydrophobia.Its effects are very doubtful.

Gentians Radix. L. E. D. P. Gentian Root. Gentiana In tea. Itis intensely bitter, has little smell, and is tonic and stomachic, indoses of gr. x to 9ij of the powder, in atonic and dyspeptic affections,and in gout, jaundice, &c. It is more commonly exhibited in infu-sion and tincture.Enters into Ext. Gentians. L. E. D. Infus. Gent. Comp. L. E. D.Tinct. Gent. Comp. L. E. D. Vin. Gent. Comp. E.

Gentia, or Gentianin. New. Also called Genliania. Is a chemicalalkaline principle found in gentian root. Digest powdered gentianin cold ether for 48 hours, filter, expose to heat in an open vessel toconcentrate the liquor, which will deposit yellow crystals on cooling.To these crystals add alcohol till it ceases to be coloured, evaporateagain to dryness, redissolve in proof spirit, filter, again evaporate todryness; redissolve in distilled water, add a little pure magnesia,boil, filter, digest the sediment in ether, and evaporate to dryness.The gentianin thus obtained is yellow, very bitter, aromatic, andinodorous.Incompatible with concentrated sulphuric acid, and also in a less degree

with all acids, which weaken its colour.Medicinally the dose is gr. ij to gr. iv twice or thrice a day as a tonic.

Geopfr^a Inermis. E. D. Cabbage-tree Bark. It has a disagree-able smell, and a sweet mucilaginous taste, and is a drastic purgativeand emetic, as well as a narcotic. It is given in doses of 3j to 3ijof the powder, as a powerful vermifuge in cases of ascarides andlumbrici; but nothing cold must be drunk during its operation.It is most commonly given in infusion or decoction.Poisonous in large doses. See Decoct. Geoffr. Inerm.Enters into Decoct. Geoffraea; Inerm. E.