The bark of the root of Rubus villosus, Rubus canadensis, and Rubus trivialis.

Characters. - In thin, tough, flexible bands, outer surface blackish or blackish-grey, inner surface pale brownish, sometimes with strips of whitish, tasteless wood adhering; inodorous; strongly astringent, somewhat bitter.

Preparation.

u.s.p.

Dose.

Extractum Rubi Fluidum ....................................................

30 60 gr. (2-4 c.c.)

Uses. - It is a pleasant astringent, its efficacy being due to tannin. It is useful in the diarrhoea of children, and also in adults.