This is a new edition of the first volume of G.P.Baker and P.M.S. Hacker s definitive reference work on Wittgenstein s Philosophical Investigations. New edition of the first volume of the monumental four-volume Analytical Commentary on the Philosophical Investigations. Takes into account much material that was unavailable when the first edition was written. Following Baker s death in 2002, P.M.S. Hacker has thoroughly revised the first volume, rewriting many essays and sections of exegesis completely. Part One - the Essays - now includes two completely new essays: 'Meaning and Use' and 'The Recantation of a Metaphysician'. Part Two - Exegesis 1-184 - has been thoroughly revised in the light of the electronic publication of Wittgenstein s Nachlass, and includes many new interpretations of the remarks, a history of the composition of the book, and an overview of its structure. The revisions will ensure that this remains the definitive reference work on Wittgenstein s masterpiece for the foreseeable future.