Cambridge: Cambridge University Press, 1994. 1st edition.

From the jacket:  "A radical new interpretation of the fundamental ideas of Ludwig Wittgenstein. Wittgenstein was essentially an empiricist, and the difference between his early views (as set forth in the Tractatus) and the later views (as expounded in the Philosophical Investigations) lies chiefly in the fact that after 1930 he replaced his version of reductionism with something subtler. So he ended where he began, as an empiricist armed with a theory of meaning."