Excrescences on Querecus lusitanica, var. infectoria, caused by the punctures and deposit of an egg or eggs of Cynips Gallae tinctoriae. Asia Minor.

Characters. - Hard, heavy, globular bodies, tuberculated on the surface, the tubercles and intervening spaces smooth; of a bluish-green colour on the surface, yellowish-white within, with a small central cavity; intensely astringent.

Composition. - Gallo-tannic acid (14 to nearly 70 per cent. according to the quality of the galls), gallic acid (3 per cent.), free sugar and resin in minute quantities.

Preparations.

B.P.

Dose.

Acidum Gallicum.........................................................................................

2-20 gr.

,, Tannicum.......................................................................................

2-30 gr.

Tinctura Gallae ..........................................................................................

1/2-2 fl. dr.

Unguentum Gallae (80 gr. to 1 oz.)................................................................

,, ,, cum Opio (80 gr. to 1 oz. nearly).................................

U.S.P.

Tinctura Gallae ................................................................................................

1/2-3 fl. dr.

Unguentum Gallae (1 part in 10).....................................................................

Action and Uses. - Galls are used in the form of galls and opium ointment as a local astringent in the treatment of haemorrhoids. The action of galls depends on the contained tannic and gallic acids (q.v.).