The Earlier Letters of John Stuart Mill, 1812–1848. Edited by Francis E. Mineka. Introduction by F. A. Hayek. (Toronto: University of Toronto Press, 1963. 2 volumes. Pp. xxvii, 784. $25.00.) - The Later Letters of John Stuart Mill, 1849–1873. Edited by Francis E. Mineka and Dwight N. Lindley. (Toronto: University of Toronto Press, 1972. 4 volumes. Pp. xlvii, 2083. $95.00.)