The Evolution of Giant Firms in Britain: A Study of the Growth of Concentration in Manufacturing Industry in Britain, 1909–70. By S. J. Prais. Cambridge: Cambridge University Press, 1976. Pp. xvii, 321, tables, charts. $19.95. - The Rise and Decline of Small Firms. By Jonathan Boswell. London: George Allen and Unwin Ltd., 1973. Pp. 272, tables. £4.75