This is Volume XV in a collection of twenty-two on 20th Century Philosophy. First published in 1966, as a part of the Muirhead library of Philosophy this work consists of selections from three courses of lectures. The first course was given in the academic year 1925-26, the second in 1928-29, and the third in 1933-34. The first two (entitled Metaphysics ) were intended primarily for Part II of the Moral Sciences Tripos; the last (entitled Elements of Philosophy ) for Part I. (The selections from the second course, which are the most extensive, are printed first.)