---At the beginning of the period covered in Volume 3, Peirce was an active member of the famous Metaphysical Club in Cambridge, where in November 1872 pragmatism was born. When cloudy weather prevented Peirce from engaging in photometric researches, he began drafting chapters of a projected logic book. Pragmatism found its first published formulation in 1877-78, in Peirce's "Illustrations of the Logic of Science," although the term does not appear in any of the six papers presented here. William James later testified that Peirce had frequently used the term "pragmatism" in conversation in the early 1870s to stand for the general theory of meaning developed in the first two "Illustrations," the best known and most popular of all Peirce's writings.