Book reviewed in this article: Back‐Crossing. By Mary Thomas. The Principles of Line Illustration. By L. N. Staniland. Medical Mycology: an Introduction to its Problems. By G. C. Ainsworth. Poplars. By T. R. Peace. Statistical Method in Biological Assay. By D. J. Finney. Insect Resistance in Crop Plants. By Reginald H. Painter.
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