Dr B.R. MITCHELL is a Fellow of Trinity College, Cambridge, and lectured in the Economics Facility at the University of Cambridge from 1967 to his retirement in 1991. His previous publications include "Abstract of British Historical Statistics" with Phyllis Deane (1962), "Second Abstract of British Historical Statistics" with H.G.Jones (1971), "British Parliamentary Election Results 1950-1964" with Klaus Boehm (1966), "Economic Developments of the British Coal Industry 1800-1914" (1984) and "British Historical Statistics" (1988) as well as previous editions of the International Historical Stat...