Extractum Cinchonae Lancifoliae. Lond.1 Extract of lance-leaved Cinchona

"Take of lance-leaved cinchona bark, bruised, fifteen ounces; water, four gallons. Boil down from a gallon of the water to six pints, and strain the liquor while it is warm. In the same manner boil it down again four successive times, in an equal quantity of water, and strain. Finally, mix the solutions together, and evaporate the mixture to a proper consistence."

Extractum Cinchonae Cordifoloiae, Lond.

Extractum Cinchonae Oblongifoliae, Lond. These are to be prepared in the same manner as the Extract of

Lance-Leaved Cinchona

Dublin. "Take of cinchona bark, in coarse powder, a pound; water, six pounds. Boil for a quarter of an hour in a vessel nearly covered; then filter the decoction while it is yet hot, and set it aside. Boil the residue again in the same quantity of water, and filter it in the same manner: repeat this a third time; and, finally, mix all the liquors, and evaporate the mixture to a proper consistence.

1 Extractum corticis Peruvianae, P. L. 1754.

"This extract should be kept in two states: one soft, fit for making pills; and the other hard, or in a state proper to be reduced to powder."

Syn. Extrait de Quinquina (F)., Wass rigtes China-extrakt (G.), Estratto di China aquosa (I.).

The operation of the same causes as those which we stated to be unfavourable to decoction, as a form of preparation for the exhibition of cinchona, are still more hurtful to its efficacy in the form of extract; and, according to Sir John Pringle, the extract is less efficacious, even in equal quantities, than the simple powder. These extracts, however, certainly contain kinates of cinchonia and quina; and they sit lightly on the stomach when the powder is rejected. They are usually ordered in doses of from grs. x. to 3 ss. dissolved in any distilled water; but it is necessary to observe, that, owing to the oxidizement of the extractive matter, the solubility of the extracts is diminished during their formation; scarcely more than one half of them is soluble in water. They have a very bitter taste, but it is less austere than the bark.

Extractum Cinchonae Lancifolliae. Edin. Resinous Extract of lance-leaved Bark

"Take of lance-leaved cinchona bark, in powder, one pound; alcohol, four pounds. Digest for four days, and pour off the tincture. Boil the residue in five pounds of distilled water for fifteen minutes, and strain the decoction, while it is hot, through a linen cloth. Repeat this coction with an equal quantity of distilled water, strain again, and evaporate the liquor to the consistence of thin honey. Distil the alcohol from the tincture until it be reduced to a similar consistence. Then mix the inspissated liquors, and evaporate them to a proper consistence in a bath of boiling water, saturated with chloride of sodium."