Highly recommended." -Choice ... an important event for the world of philosophy. For the first time we have available in an intelligible form the writings of one of the greatest philosophers of the past hundred years." -The Times Literary Supplement Volume 5 of this landmark edition covers an important transition in Peirce's life, marked by a rekindled enthusiasm for speculative philosophy. The writings include essays relating to his all-embracing theory of categories as well as papers on logic and mathematics.