The most important development in John Stuart Mill scholarship of the past half century is the publication of the Collected Works of John Stuart Mill in thirty-three volumes (1963–1991), with John M. Robson as general editor. This is a monumental publication by the University of Toronto Press, which will provide data for Mill scholars in years to come. The seven volumes of letters and many volumes of essays, speeches, and journals, show that most of his writing was not on narrowly philosophical topics: Much of it was on concrete political issues of his day. There are four volumes of newspaper writings. The Collected Works also makes available all of the revisions in successive editions of his major works, such as System of Logic (Vols. VII–VIII) and Principles of Political Economy (Vols. II–III, and it makes available out-of-print works such as his...