3. (From RED BARK:—Extract of red cinchona, E. of red bark, E. of oblong-leaved b.; Extractum cinchonæ rubræ, L.)—a. (Ph. L.) From red bark, as EXTRACT OF CINCHONA—Ph. L. (above).
b. (Ph. L. 1836.) From the decoction.
Obs. These extracts are ordered to be kept in two states, the one (SOFT EXTRACT OF CINCHONA; EXTRACTUM CINCHONÆ MOLLE) for making pills, &c.; the other (HARD EXTRACT OF CINCHONA; EXTRACTUM CINCHONÆ DURUM) for powdering.—The dose, &c., of all the above are the same.
4. (Dry:—Essential salt of bark; Extractum cinchonæ siccum, L.)—a. (P. Cod.) From an aqueous infusion of pale bark (prepared by displacement with water at a temperature not above 77° Fahr.), evaporated to the consistence of a thick syrup, and then spread thinly and uniformly on earthenware dishes, or sheets of glass, and dried in a stove,
by a very gentle heat. It is separated from the plates with a knife, and preserved in well-closed phials. Prior to spreading it out on the plates, about 4% or 5% of thick mucilage is commonly added.
b. (Ph. Bor.) As the above (nearly).
c. (Ph. Hann. 1831.) Similar to the above; but the liquid, when it acquires the consistence of treacle, is diluted with water, and again evaporated to a like consistence; and this dilution and evaporation is repeated until, on the addition of water, it forms a clear solution.—Dose, 5 to 25 gr. The product of the last formula is nearly inert, and that of the others possesses little activity.
5. (Fluid:—Extractum cinchonæ fluidum, L.)—a. See Liquor of Cinchona.
b. (Dr Neligan.) From yellow bark, as FLUID EXTRACT OF BUCHU.
6. (Resinous:—Alcoholic extract of bark; Extractum cinchonæ alcoholicum, E. cinchonæ, L.)—a. (Ph. E.) From any variety of cinchona bark (in powder), 4 oz.; proof spirit, 24 fl. oz.; prepare a tincture by displacement, distil off most of the spirit, and evaporate the residuum to the consistence of an extract. This is the only EXTRACTUM CINCHONÆ of the Edinburgh College.