GUM

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the pectic. Guibourt says, it is a peculiar principle, which he termsgrossuline.

Grosvenor's Tooth Powder. A nostrum prepared by mixing ftiijeach of calcined oyster-shells and rose pink, ftss of Florentine iris-root in powder, and 25 drops of oil of rhodium ; and after pulveriz-ing it very finely, pass it through a sieve.

Ground Ivy. See Glechoma.

Groundsel. Senecio vulgaris. A common native plant, the infusionof which is purgative, or emetic, according to its strength. Dr.Good says it is useful in sick stomach. It is used externally incataplasms.

Guaranine. New. A vegetable principle discovered in the fruit ofPaullinia Sorbilis by M. Martius. It is white, crystalline, and bit-ter, and precipitates the aqueous solutions of nitrate of silver, &c.(Kastner.)

Guido's Balsam. See Tinct. Sap. et Opii.

Guaiacine. See Gayacine.

Guaiaci Resina f.t Lignum. L. E. D. P. Guaiac Resin and Wood,from the Guaiacum officinale, both of which are favourite prescrip-tions with many. The wood has a warm, bitter, acrid taste, and isfragrant when exposed to heat. The decoction was long esteemed aspecific in syphilis, but has lost its reputation. The resin is consider-ably different from other resins, as it becomes green on exposure tolight, and colourless when exposed to heat. It has similar proper-ties to the wood, but all of them proportionally stronger.Incompatible with the sulphuric, muriatic, and nitric acids, and with

alkalies and their carbonates.Adulterated with manchineel gum, which may be detected by dissolvingsome of the suspected gum in proof spirit, adding a few drops ofsweet spirit of nitre, and diluting it with water, when the guaiacwill be precipitated, and the manchineel will float. When it isadulterated with common resins, the fraud will be discovered by thesmell emitted when it is burning.Medicinally it is diaphoretic and alterative, and prescribed in chronicrheumatism, cutaneous disorders, and syphilitic pains and eruptions,in doses of gr. v to 9j in pill, bolus, or emulsion, with gum arabic,mucilage, or yolk of eggs. When it is given in doses of 9j to 3ij itis aperient.Enters into Decoct. Guaiaci Comp. E, Decoct. Sarsaparillae Comp.L. D. Mist. Guaiaci. L. Tinct. Guaiaci. L. E. D. Tinct. GuaiaciAmnion. L. E. D.

Gummi AcAcia; vel Arabicum. See Acacite Gummi.

Gum Ammoniac. See Ammoniacum.