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Chap. XXXV. Of Extracts and Resins.

597

aside. Boil the residuum again, in the same quantity ofwater, and filter it in the same manner. This may be re-peated a third time, and all the decoctions are to be mix-ed and reduced to a proper degree of thickness by evapo-ration.This extract ought to be kept in two states; one soft, adapt-ed for making pilis j and the other hard, capable of beingpulverised.

EXTRACTUM COLOCYNTHIDIS. Loild.

Extract of Colocynth.Take of

Pulp of colocynth, one pound ;

Water, one gallon.Boil to four pints, and filter the liquor while hot. Lastly,

evaporate to a proper thickness.

Mr Phillips says, that it is scarcely possible to boil the colo-cynth in the assigned quantity of water, and that the extractobtained is remarkably spongy, and very soon becomes hardand mouldy.

EXTRACTUM COLOCYNTH1DIS COMPOSITUM. Dub,

Compound Extract of Colocynth.

Take of

Pith of colocynth, cut small, six drachms;Hepatic aloes, one ounce and a half;Scammony, half an ounce ;Lesser cardamom seeds, husked, one drachm ;Castile soap, softened with warm water, so as to have a ge-latinous consistence, three drachms;Warm water, one pint.

Digest the colocynth in the water, in a covered vessel with amoderate heat, for four days. To the liquor, expressedand filtered, add the aloes and scammony, separately re-duced to powder : then evaporate the mixture to a properthickness for making pills, having added, towards the endof the evaporation, the soap-jelly and powdered seeds ; andmix all the ingredients thoroughly together.

ExTHACTUM GENTIANS. Lond.

Extract of Gentian.Take of

Gentian root, one pound ;Boiling water, one gallon.