"Take of jalap root, powdered, two pounds; rectified spirit, a gallon and a half; distilled water, two gallons. Macerate the jalap root in the spirit for four days, and decant the tincture. Boil the residue in the water down to half a gallon.

1 Brande's Manual, p. 397.

2 Edin. Medical and Surg. Journal, vol. ix. pp. 6. 11. 3 Extractum Jalapii, P. L. 1745.

Then strain separately the tincture and the decoction; distil the former, and evaporate the latter, until both begin to thicken. Lastly, mix the extract with the resin, and evaporate the mixture to a proper consistence.

"This extract should be kept in a soft state, fit for forming pills, and in a hard state, so that it may be reduced to powder."

Extractum Convolvulae Jalapae. Edin. Extract of Jalap

This is ordered to be prepared from the root, in the same manner as the extract of cinchona bark. (Edin.)

Extractum Jalapae. Dub. Extract of Jalap

"Take of jalap root, bruised, a pound; rectified spirit, four pints; water, a gallon. Macerate the jalap root in the spirit four days, and pour off the spirit. Boil what remains in the water to two pounds. Then strain the tincture and the decoction separately : evaporate the latter, and distil the former, until each are inspissated. Finally, mix the extract with the resin, and continue the evaporation, by means of steam, until the whole is of a proper thickness"

Syn. Extrait de Jalap (F.).

One cwt. of jalap yields about 50 lbs. of watery extract, and fifteen of resinous extract.1 These extracts contain all the active principles of the jalap root. They are, however, apt to gripe during their operation : thence, particularly when given to children, they should be triturated with sugar and almonds, or mucilage, so as to form an emulsion, in which state they operate freely, and without griping. The dose, to an adult, is from grs. x. to Эj.