This volume contains about 375 letters by John Stuart Mill since the publication of Earlier Letters in 1962 and Later Letters in 1972. Though it covers a vast range of topics, the collection has three specially interesting groups: a series of letters to Henry Cole, dealing amongst other things with the disposition of the London and Westminster Review ; the full versions of letters to Theodor Gomperz, Mill’s leading German disciple and translator, which had been thought destroyed; and recently found internal correspondence in the Examiners office of the East India company which sheds new light on Mill’s career. The Editor’s introduction, places the letters in context, gives details about the three special groups, and outlines the history of the collection. The letters are presented in full scholarly form, with notes giving information about the texts and their provenance, and also historical and biographical information. The specially valuable appendix consists of the first published check list of letters to Mill, with their location. Other appendices give variant readings from the Gomperz letters, a finding list of form letters signed by Mill in the India Office Library and Records, an index of correspondents represented in this volume, an index of persons and works cited in the letters, and an analytical index.