3. (Fluid; E. b. fluidum, L.—W. Procter.) Buchu leaves, 8 oz.; rectified spirit, 16 fl. oz.; for a tincture by displacement, adding water, until 12 fl. oz. have passed through; allow this to evaporate spontaneously until reduced to one half; next digest the mass in the percolator with cold water, 1 pint, for 12 hours, express a pint, and evaporate this to 10 fl. oz.; lastly, add the 6 fl. oz. of residual tincture, agitate together, and in a few days filter, or decant the clear portion.—Dose, 1 to 2 teaspoonfuls. See Diosma.
Extract of Buck′bean. Syn. Extractum menyanthis, L. Prep. 1. (P. Cod.) From the expressed juice of the fresh plant.
2. (Ph. Bor.) From the infusion made with boiling water. Bitter, tonic and astringent.—Dose, 5 to 10 gr. In large doses it is purgative, cathartic, and even emetic.
Extract of Buck′thorn. Syn. Extractum rhamni, E. baccarum r., L. Prep. From the filtered expressed juice of buckthorn berries. Some persons allow it first to run into a state of fermentation; but the quantity of the product is thereby greatly lessened. Hydragogue and purgative.—Dose, 15 gr. to 1 dr., or more.
Extract of Bur′dock. Syn. Extractum bardanæ, L. Prep. 1. From the decoction of burdock root.
2. (P. Cod.) As EXTRACT OF BISTORT—P. Cod. In gout, rheumatism, skin diseases, &c.—Dose, 10 gr. to 1 dr. Sir Robert Walpole praised burdock root as a gout medicine; and others have considered it an excellent substitute for sarsaparilla. (Lindley.)
Extract of Butter-nut. Syn. Extractum juglandis, L. Prep. (Ph. U. S.) From the inner bark of the root of the butter-nut or white walnut (Juglanda alba), as EXTRACT OF BITTER SWEET—Ph. U. S. A mild, yet efficacious aperient and vermifuge.—Dose. As a laxative, 5 to 10 gr.; as a purgative, 15 to 30 gr.
Extract of Cainca Root. Syn. Extractum
caincæ. (P. Pharm.) Prep. Put 10 oz. of the dried root of cainca into a percolator, pour on it proof spirit q. s. to penetrate the powder in every part, and let it remain 12 hours; then let the liquid drain, and pass successively through the powder in the percolator as much proof spirit as will amount with that previously used to 60 oz. by weight. Distil off the spirit and evaporate to a soft extract.
Extract of Calabar Bean. Syn. Extractum physostigmatis. (B. P.) Calabar bean in coarse powder, 1; rectified spirit, 5; macerate the bean for 48 hours in one fourth of the spirit in a closed vessel, agitating occasionally, then transfer to a percolator, and when the fluid ceases to pass add the remainder of the spirit, so that it may slowly penetrate through the powder; subject the residue of the bean to pressure, adding the pressed liquid to the product of the percolation; distil off the spirit, and evaporate what is left to the consistence of a soft extract by a water bath.—Dose, 1⁄16 to 1⁄4 gr.