ABSTRACT
The introductory chapter of the logic book was read by Charles S. Peirce before the Metaphysical Club. Peirce had been working on his logic book from March 1872 to July 1873. In both the logic book and the Illustrations, Peirce regards his theory of inquiry as a consequence of his conception of reality, a conception which he had explicated in the Journal of Speculative Philosophy series in 1868–1869 and in the 1871 Berkeley review. In a draft of the fifth chapter of the 1873 Logic, Peirce explains that every cognition is of the nature of a sign. The characterization given of "representations" or "signs" in the logic book can be taken as especially applying to one only of the members of the semiotic typology, namely to symbols. In the chapters of the 1873 logic book that follow the analysis of the concept of representation, Peirce gives an exposition of the doctrine of syllogism and of logical quantities of terms.
