Technology in the 1900s: Developments in hydraulic cements: Proceedings of the Royal Society Meeting for Discussion, February 16–17, 1983; edited by P. Hirsch, J. D. Birchall, D. D. Double, A. Kelly, G. K. Moir and C. D. Pomeroy; published by the Royal Society, London, 1983; 207 pp.; price, £31.80 (U.K.), £33.35 (overseas0; available from Publications Sales Department, Royal Society, 6 Carlton House Terrace, London SW1Y 5AG, Gt. Britain