Dose, 1/20 - 1/2 gr.; 3 - 30 mgms. A white crystalline powder. Soluble 1 in 8-9 of water, slightly in cold, freely in hot alcohol.

Jalapa. Jalap. Dose, 5 - 20 grs.; 3 - 12 dgms. The dried tubercules of Ipomaea purga. Dark brown, irregularly oblong, ovoid, napiform or fusiform roots, from 1-3 inches long, hard, compact and heavy; externally wrinkled and furrowed and marked with small transverse scars. Internally varying in colour from yellowish-grey to dingy brown. Odour characteristic, taste at first sweet but afterwards acrid and disagreeable. The resin contains the active principles, which are two glucosides, jalapin and scammonin.

2Extractum Jalapæ. Dose, 2 - 8 grs.; 1 - 5 dgms. A dried product obtained by evaporation of an alcoholic and an aqueous extract.

1Pulvis Jalapæ Compositus. Dose, 20 - 60 grs.; 1.2 - 4 gms. - 33.3; Acid Potassium Tartrate, 60; Ginger, 6.6.

1Jalapæ Resina. Dose, 2 - 5 grs.; 1 - 3 dgms. Dark brown opaque fragments translucent at the edges, brittle; odour sweetish; taste acrid. Soluble, readily in alcohol, insoluble in water.

3Tinctura Jalapæ. Dose, 30 - 60 min.; 2 - 4 c.c. Standardised to contain 1.5% of Jalap Resin.

Juniper (see Oleum Juniperi p. 76).