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Of the Pharmacopoeia of the United States (1842), is directed to be prepared as follows: Yellow Bark, in coarse powder, tbj; Alcohol, Oiv; Water, a sufficient quantity. Macerate the Peruvian bark with the alcohol for four days; then filter by a displacement apparatus, and when the liquid ceases to pass, pour gradually on the bark water sufficient to keep its surface covered. When the filtered tincture measures four pints, set it aside, and proceed with the filtration until six pints of infusion are obtained. Distil off the alcohol from the tincture and evaporate the infusion till the liquids are respectively brought to the consistence of thin honey; then mix and evaporate to form an extract.-Ph. U. S.