This is a course on the later philosophy of Wittgenstein. One of the aims of the course is to provide a solid understanding of the Philosophical Investigations and other of Wittgenstein's later writings. A second aim is to illustrate the continuing relevance of Wittgenstein's thought by bringing it to bear on questions of current philosophical interest. The last two times this course was taught, the emphasis was on the bearing of Wittgenstein's thought on issues in the philosophy of mind and the philosophy of language. This time the emphasis will be on the bearing of his thought on issues in social epistemology.