Book reviewed in this article: Plant Molecular Biology Manual. Ed. by S. B. Gelvin, R. A. Schilperoot and D. P. S. Verma. Living Resources for Biotechnology. Ed. by D. L. Hawksworth and B. E. Kirsop. Haploids in Crop Improvement. I. Ed. by Y. P. S. Bajaj. Bioactive Compounds from Plants. Ciba Foundation Symposium 154. Ed. by D. J. Hardwick and Joan Marsh. Hops. By R. A. Neve. An Introduction to Tropical Rain Forests. By T. C. Whitmore. Ecological Experiments: Purpose, Design and Execution. By Nelson G. Hairston, Sr. Advances in Pollination Ecology. Ed. by A. Dafni and D. Eisikowitch. Phycology. By R. E. Lee.