 After retirement from Harvard, Lewis taught and lectured at a number of universities, including Princeton, Columbia, Indiana, Michigan State, and Southern California, but principally at Stanford. His 1954 Woodbridge Lectures at Columbia and 1956 Mahlon Powell Lectures at Indiana resulted in two last short books in ethics, The Ground and the Nature of the Right (Lewis 1955) and Our Social Inheritance (Lewis 1957). Lewis was the subject of a posthumously published “Library of Living Philosophers” volume (Schilpp 1968) in which, unfortunately, his replies to critics were limited by illness, but which, nonetheless, was an honour that indicates his standing in and perceived significance for American philosophy in the 1950s. 