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ADLER (H).—Alternating Generations. A Biological Study of Oak Galls and Gall Flies. By Hermann Adler, M.D., Schleswig. Translated and edited by Charles R. Straton, F.R.C.S. Ed., F. E. S. $3.25.

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BATESON (W.).—Materials for the Study of Variation, treated with especial Regard to Discontinuity in the Origin of Species. By William Bateson, M.A.. Fellow of St. John’s College, Cambridge. With many cuts. 8vo. $6.50.

BEDDARD (F. E.).—Animal Colouration. With 4 Coloured Plates, and Woodcuts in the Text. By Frank Evers Beddard, M.A., F.R.S., Prosector to the Zoölogical Society of London and Lecturer on Biology at Guy’s Hospital. 8vo. $3.50.