Saul Kripke has thought uncommonly hard about the central argument of Wittgenstein's Philosophical Investigations and produces an uncommonly clear and vivid account of that argument ...clearly and compellingly presented ...an exemplary piece of exposition. Times Literary Supplement "A detailed examination of what is clearly a central theme in Wittgenstein's writings." Times Higher Education Supplement "Kripke does bring a whole range of things into focus in a striking and provocative way ...What Kripke has achieved, I think, is the first successful translation of what Wittgenstein was saying into the idiom of the contemporary Anglo-American mainstream in philosophy ...full of excellent things." Australasian Journal of Philosophy.