Pragmatism, logic, and manuscript R318

Whereas it is generally held that Peirce’s logic contributed largely to a proof of his pragmatism, particularly in the 1907 manuscript R318, the paper adopts an alternative approach and posits that after 1903, Peirce’s conception of the sign and the way it functions evolved significantly in the period leading to and including the various versions of this never-to-be-published article which set out his conception of pragmatism in 1907. The paper suggests that in attempting to explain his pragmatism in manuscript R318, Peirce was consciously departing from earlier conceptions of the sign and the way it relates to its two correlates. It suggests that this departure nevertheless contributed to the continuing evolution of his logic, and shows how R318 anticipates features of the systems described in the 23 December 1908 letter to Lady Welby and subsequent drafts while nevertheless being a completely different approach to signification. It finally suggests that there is a potential inconsistency in the definition of semiosis given in the manuscript and the theoretical distribution of the interpretant system described therein. The present paper is offered as one possible account of some stages in the evolution of Peirce’s logic.