The bark of Xanthoxylum fraxineum, and of Xanthoxylum caro-linianum.

Characters. - Xanthoxylum fraxineum is in curved or quilled fragments, about - 1/25th inch thick; outer surface brownish-grey, with whitish patches and minute, black dots; inner surface whitish, smooth, inodorous; bitterish, very pungent.

Xanthoxylum carolinianum resembles the preceding, but is about 1/12th. inch thick, and is marked by many conical, corky projections, and stout, brown spines.

Preparation

Dose.

Extractum Xanthoxyli Fluidum...................................................

30-60 min.

Composition. - It contains a volatile oil, resins, and possibly berberine.

Action and Uses. - Its action seems to be that of an aromatic and somewhat irritant bitter, somewhat resembling mezereum and guaiac. Like these drugs it is used in rheumatism. The bark is chewed to relieve toothache, and to aid recovery in palsy affecting the tongue.