Above the other titles he might justly have claimed, Charles S. Peirce prized the title `logician`. He expressed in several places his confidence that his own special talent lay in the direction of logical analysis.1 Indeed, in the judgment of some of the best authorities in the field today, he was a logician of great originality and power. Late in 1896 Peirce invented a system of logic diagrams which he soon began to call the `existential graphs` (`EG` abbreviates `the system of existential graphs`). He was 57 years old at the time, and had already made what scholars take to be his most significant contributions to modem symbolic logic. In fact, his interest in the graphs grew, to a large extent, out of his pioneering work on symbolic logic. As he developed the system in the years after 1896 he began to fmd it relevant to such topics as modality, the theory of signs, his doctrine of the categories, and his philosophy of pragmaticism. By 1905 Peirce claimed that EG was quite the luckiest fmd that has been gained in exact logic since Boole",s in 1908 he called it-or the theory of logical analysis which he based on it-his `chef d`oeuvre,, and in 1909 he wrote to William James that EG I"ought to be the logic of the future"."
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