Wittgenstein made numerous pronouncements about philosophical method. But did he practice what he preached? Cook addresses this question by studying Wittgenstein’s treatment of the problem of other minds, tracing a line of argument that runs through his writings and lectures from the early 1930s to the 1950s. Cook finds that there is an inconsistency between Wittgenstein’s methodological advice and his actual practice. Instead of bringing words back from their metaphysical to their everyday use, he allows himself to use uncritically words whose provenance is clearly metaphysical.