EXTKACTS.

81

EXTHACTUM COLOCYNTHIDIS.

Take of Colocynth, a pound;Water, two gallons.Boil gently for six hours, replacing the eva-porated water occasionally. Strain the li-quor while hot; and evaporate it in the va-pour-bath to the due consistencc.

EXTHACTUM CONII.

Take of Conium any convenient quantity;beat it into a uniform pulp in a marble mor-tar, express the juice, and filter it. Let thisjuice be evaporated to the consistence of avery firm extract either in a vacuum withthe aid of heat, or spontaneously in shallowvessels exposed to a streng current of airfreed of dust by gauze-skreens.

This extract is of good quality only whena very streng odour of conia is disengagedby degrees on its being carefully trituratedwith Aqua potassae.

EXTRACTUM DIGITALIS.

This extract is best prepared from the freshleaves of Digitalis, by any of the processesindicated for extract of conium.

EXTHACTUM ELATERII, seu ELATERIUM.

Take of the fruit of Momordica elateriumbefore it is quite ripe, any convenient quan-tity ; cut the fruit and express the juice gent-ly through a fine sieve; allow the liquid to