First published in 1973, Sir Anthony Kenny's classic introduction to Wittgenstein was widely praised for offering a lucid and historically informed account of the philosopher's core concerns. Kenny's study is also remarkable for demonstrating the continuity between Wittgenstein's early and late writings. Focusing on Wittgenstein's philosophy of mind and language, Kenny closely examines the works of the middle years. He exposes apparent conflicts and then goes on to reconcile them, providing a persuasive argument for the unity of Wittgenstein's thought. This revised edition includes an extensive new introduction in which Kenny outlines developments in Wittgenstein scholarship since the book was first published and assesses Wittgenstein's influence in the latter part of the twentieth century.