GALL, in Natural History, denotes any protuberance or tumour produced by the puncture of insects on plants and trees of different kinds. These galls are of various forms and sizes, and not less different in their internal structure than in their external form. Some have only one cavity, and others a number of small cells communicating with one another; and some of them are as hard as the wood of the tree they grow on, whilst others are soft and spongy. The former are termed gall-nuts, and the latter berry-galls or apple-galls.