Book reviewed in this article: Comparative physiology of the nervous control of muscular contraction. By Graham Hoyle, D.Sc Parthenogenesis and Polyploidy in Mammalian Development. By R. A. Beatty (Cambridge Monographs in Experimental Biology) Introduction to Bacterial Physiology. By C. E. Clifton. The Origin of Life on the Earth. By A. I. Oparin. Third revised and enlarged edition. Translated from the Russian by Ann Synge. Principles of Immunology. By John E. Cushing and Dan H. Campbell.> Common Diseases of Vegetables in South Africa. By Vincent A. Wager. Proceedings of the Third British Weed Control Conference, 1956The Biological Action of Growth Substances. Symposia of the Society for Experimental Biology The U.C. System for Producing Healthy Container‐Grown Plants. Edited by K. F. Baker. Control of the Plant Environment. Proceedings of the University of Nottingham Fourth Easter School in Agricultural Science. 1957. Ed. J. P. Hudson. Magnesium, the Fifth Major Plant Nutrient. By A. Jacob. Translated by Dr Norman Walker
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