Ecological Concepts. The Contribution of Ecology to an Understanding of the Natural World. J. M. Cherrett et al., Eds. Blackwell Scientific, Boston, 1989. viii, 385 pp., illus. $92.95; paper, $43.95. British Ecological Society Symposium 29. From a symposium, London, April 1988; Toward a More Exact Ecology. Peter J. Grubb and John B. Whittaker, Eds. Blackwell Scientific, Boston, 1990. x, 468 pp., illus. $92.95; paper, $43.95. British Ecological Society Symposium 30. From a symposium, Oxford, U. K., Sept. 1988.
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