Abstract
THE order Hymenoptera has never been a popular study, in the sense in which the Coleoptera and Lepidoptera have become so during the last century, but it probably numbers among its votaries nearly three times as many students as any of the remaining orders. Nor is this surprising, for although it cannot compete with the Lepidoptera in beauty of colouring, it surpasses the Coleoptera in its variety of form, and is probably more numerous in species than any other order. It supplies us with some of the most valuable products which are yielded by insects, such as honey and ink, and stands at the head of the insect world, both in intelligence and in diversity of habits. Alternating Generations; a Biological Study of Oak Galls and Gall Flies. By Hermann Adler, Schleswig. Translated and edited by Charles R. Straton, F.R.C.S., Ed., F.E.S. With illustrations. (Oxford: Clarendon Press, 1894.)
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