The protuberances on various kinds of trees, supposed to originate in the puncture of an insect. Some are hard, and are therefore called nut-galls; others soft, which are called berry, or apple-galls. The best are the nut-galls of the oak; and the most esteemed of this species are brought from Aleppo. They are not smooth on the surface, but tubercular, small and heavy, and should have a bluish or blackish tinge. By infusing 500 grains of Aleppo grains broken into small pieces in distilled water, Sir H. Davy obtained, by evaporating the fluid, 185 grains of solid matter, which, on analysis, gave 130 of tannin; 12 mucilage and insoluble matter; gallic acid, with a little extractive matter, 31; remainder calcareous earth and saline matter, 12. The extensive use of galls in dying, tanning, and in making ink, is well known, for which see the separate articles under their initial letters.