An excrescence on Quercus lusitanica Lamarck (nat. ord. Cupuliferae), caused by the punctures and deposited ova of Cynips Galls tinctoriae Olivier (class Insecta; order Hymenoptera.

Habitat - Levant.

Characters

Subglobular, 1 or 2 cm. in diameter, more or less tuber-culated above, otherwise smooth, heavy, hard; often with a circular hole near the middle, communicating with the central cavity; blackish olive-green or blackish-gray; fractute granular, grayish; in the centre a cavity containing either the partly developed insect, or purulent remains left by it; nearly inodorous, taste strongly astringent.

Composition

The chief constituents are - (1) Tannic Acid, 50 to 60 per cent. (2) Gallic Acid, 2 to 3 per cent. (3) Sugar. (4) Resin.

Incompatibles. - See Tannic and Gallic Acids, p. 593 and p. 596.

Preparations

1. Tinctura Gallae. - Tincture of Nutgall. Nutgall, 200; by maceration with Glycerin, 100, and Alcohol to 1000.

Dose, 1 to 2 fl. dr.; 4. to 8. c.c.

2. Unguentum Gallae. - Nutgall Ointment. Nutgall, 20; Ben-zoinated Lard, 80.