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THE OAK.

Some of the resulting galls are discoid, such as the "oak-spangles" of our woods; others, again, are spherical, such as the common leaf-galls so well known in England, and the so-called oak-apple; then there are the "artichoke galls," produced by the partial metamorphosis of the buds of the oak in which the Cynips has laid its egg, and many others.