Figures & data
Figure 1 Charles S. Peirce, Existential Graphs. From MS Am 1632 (292), ‘Prolegomena to an Apology of Pragmatism’ (1906), unnumbered sheet. Houghton Library, Harvard University.
Figure 2 Charles S. Peirce, MS Am 1632 (404), ‘The Art of Reasoning’ (1893–1895), p. 36 (detail). Houghton Library, Harvard University.
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