REVIEWS

Book reviewed in this article: Lower Upper Cretaceous Plant Microfossils from Minnesota . By R ichard L. P ierce . Rubber: Botany, Production and Utilization . By L oren G. P olhamus . Manipulations de Botanique . By L. G enèves . Chromosome Numbers of Central and Northwest European Plant Species . Opera Botanica (Botaniska Notiser supplement) Vol. 5. By A. and D. L öve . Synthesis of Molecular and Cellular Structure . Edited by D orothea R udnick . Contemporary Botanical Thought . Edited by A. M. M acleod and L. S. C obley . Flora of New Zealand . Vol. I. Indigenous Tracheophyta: Psilopsida, Lycopsida, Filicopsida, Gymnospermae, Dicotyledons. By H. H. A llan . A Review of Nitrogen in the Tropics with Particular Reference to Pastures— A Symposium . Bulletin No. 46 of the Commonwealth Bureau of Pastures and Field Crops. Edited by a Committee of the Division of Tropical Pastures, C.S.I.R.O., Australia. Control Mechanisms in Cellular Processes . The Seventh Annual Symposium publication of the Society of General Physiologists. Edited by D avid M. B onner . Recent Advances in Botany . From lectures and symposia presented to the IX International Botanical Congress, Montreal 1959. Vols. I and II. Encyclopaedia of Plant Physiology . Edited by W. R uhland . Vol. XVI. External factors Affecting Growth and Development. Sub‐editor: G. Melchers. Advances in Genetics . Vol. X. Edited by E. W. C aspari and J. M. T hoday . Soil Micro‐organisms and Higher Plants . By N. A. K rasilnikov . Translated by Y. Halperin. An Introduction to the Cytogenetics of Polvploids . By G. W. P. D awson . Plant Pathology: An Advanced Treatise . Vol. III: The Diseased Population, Epidemics and Control. Edited by J. G. H orsfall and A. E. D imond .