Diderot, Political Writings, ed. John Hope Mason and Robert Wokler, Cambridge, Cambridge University Press, 1992, pp. xli + 225. - Malthus, An Essay on the Principle of Population, ed Donald Winch, Cambridge, Cambridge University Press, 1992, pp. xxxiii + 392. - Price, Political Writings, ed. D. O. Thomas, Cambridge, Cambridge University Press, 1991, pp. xxiv + 199.