Books reviewed in this article: Techniques in Photomorphogenesis. Ed. by H. Smith and M. G. Holmes Reaction-Diffusion Equations and their Applications to Biology. By N. F. Britton Somaclonal Variations and Crop Improvement. Advances in Agricultural Biotechnology (Series). Ed. by J. Semal The Cytoskeleton: Cell Function and Organization (Journal of Cell Science, Supplement 5). Ed. by C. W. Lloyd, J. S. Hyams and R. M. Warn Membranes, Metabolism, and Dry Organisms. Ed. by A. Carl Leopold Water Fungi and Plants. Ed. by P. G. Ayres and L. Boddy The Rhizosphere. By E. A. Curl and B. Truelove Symbiosis. An Introduction to Biological Associations. By V. Ahmadjian and S. Paracer.