Letters to the Editor

Biology: A Functional Approach Second edition M. B. V. ROBERTS 656 pp., illustrated. London: Nelson, 1976. £4.95 Reviewed by John Feltwell

R. N. SAVELAND (Ed.) Sponsored by the International Union for the Conservation of Nature (IUCN) 267 pp., illustrated. London and New York: John Wiley, 1976. £7.50. Reviewed by J. Bossanyi

Theoretical Ecology: Principles and Applications R. M. MAY (Ed.) 317 pp. Oxford: Blackwell Scientific, 1975. £8.50 boards, £4.80 paper. Reviewed by D. M. Keith-Lucas

The Battle Against Bacteria—A Fresh Look Second edition P. BALDRY 179 pp., illustrated. London: Cambridge University Press, 1976. £4.50. Reviewed by C. G. Gayford

Student's Collection of Electron Micrographs J. J. HEAD 46 pp., illustrated. London: Edward Arnold, 1976. £2.50. Reviewed by John Feltwell