Theory of Knowledge gives us a picture of one of the great minds of the twentieth century at work. It is possible to see the unsolved problems left without disguise or evasion. Historically, it is invaluable to our understanding of both Russell's own thought and his relationship with Wittgenstein.

This important work was abandoned by Russell under the impact of Wittgenstein's ideas. It was first published in 1984 and is presented here for the first time in a handy student edition, with an introduction by Elizabeth Ramsden Eames.