First published in 2005. Twentieth-century philosophy, more than that of any other period, has become deeply and sharply conscious of the connection between philosophical problems and language. We now seem to have entered what might well be called the Wittgensteinian 'moment' in philosophy. This volume seeks to provide a general survey of Wittgenstein's thought, considering both the Tractatus LogicoPhilosophicus (1922) and the Philosophical Investigations (1953), and also to give some account of the influence which these two very different books have exercised.