PART III.

Extracts.

629

EXTRACTUM CORTICIS QUERCUS. Dub. Extractof Oak Bark.' 1

This extract is ordered to be prepared in the same manneras the simple extracts. It consists principally of tannin, whichis, therefore, not liable to be injured by this form of prepara-tion ; but it possesses no peculiar advantages to recommend itto particular notice.

EXTRACTUM RHEI. Lond. Extract of Rhubarb*

" Take of rhubarb root bruised, a pound; proof spirit, apint ; water, seven pints. Macerate for four days in a gentleheat; then strain the solution, and set it apart that the fecu-lencies may subside. Pour off the clear liquor, and evaporateit to a proper consistence."

Although the purgative properties of the rhubarb be obtainedto a certain degree in this extract, yet its virtues are certainlyimpaired during the inspissation; and the simple infusion isin every respect a preferable form of preparation. The dose isfrom grs. x. to 3fs. given in the form of pills, or dissolved inpeppermint water.

EXTRACTUM RUT^ GRAVEOLENTIS. Edin. Ex-tr actum Foliorum RuTiE. Dub. Extract of Rue.

The Edinburgh extract is to be prepared in the same manneras the extract of gentian; the Dublin after the manner of thesimple extracts. Prepared by either process, this extract is in-odorous, and has a bitter acrid taste. Its medicinal propertiesare different from those of the plant, the stimulant and narcoticpowers of which depend on the volatile oil it contains, which isdissipated during the inspissation of the extract. The dose isfrom grs. x. to 9j. in pills.

EXTRACTUM FOLIORUM SABIN^E. Dub. Extractof Savine.

To be prepared in the same manner as the simple extracts.It is a simple bitter of little efficacy, for the acrid volatile oilon which the efficacy of savine depends is dissipated by theheat employed during the inspissation. The dose is from grs.x. to 5fs. in pills.

SUCCUS SPISSATUS SAMBUCI NIGR^E. Edin.The inspissated Juice qfthe Black Eldei: 3

" Take of the ripe berries of the black elder, five parts;purified sugar, one part. Boil with a gentle heat to the con-sistence of thick honey.

EXTRACTUM SARSAPARILLiE. Lond. Extract ofSarsaparilla.

' EstraitodellaQurrcia (/.) J Exirait de Khubarbe (F.) Rhabarber-extrakt X G.)3 Eingedicker Flifdersaft (<?.)

SS3