The bark, deprived of its outer layer, of Pinus Larix (Abies Larix), the common larch.

Characters. - In flat pieces or sometimes large quills, with the inner surface yellow and fibrous, and the outer surface reddish-brown under a greyish epidermis. Odour faint, resembling turpentine, taste astringent.

Composition. - A peculiar tannin striking olive-green with salts of iron, and larixinic acid or larixin.

Preparation.

B.P.

Dose.

Tinctura Laricis.................................................................

20-30 min.

U.S.P

Not given.

Action and Use. - It has the same action as oil of turpentine. It is seldom used except as a stimulant expectorant in chronic bronchitis with abundant secretion.