This is part of a three-volume collection of most of David Lewis' papers in philosophy, except for those that previously appeared in his Philosophical Papers (Oxford University Press, 1983 and 1986). They are now offered in a readily accessible form. This second volume is devoted to Lewis' work in metaphysics and epistemology. The purpose of this collection, and the volumes that precede and follow it, is to disseminate more widely the work of an eminent and influential contemporary philosopher. The volume will serve as a useful work of reference for teachers and students of philosophy.