LOGIC (MS 339-1009)
Published, in part, as 2.445-460 (pp. 211-232, with deletions). Unpublished are CSP's comments on the contributions to philosophy of Hamilton, Kant, DeMorgan, and Aristotle as logicians. Importance of the syllogism, especially of the figures, in probable inference. The reduction of syllogistic forms. Natural classification of the moods. Formal fallacies, e.g., ignoratio elenchi and petitio principii. Semi-material fallacies, e.g., fallacies of ambiguity and erroneous particularization.
Ambiguity, Aristotelian logic, Ignoratio elenchi, Inference, Logic (modal see Modality), Particularization fallacy of erroneous, The "Grand Logic" ("How to Reason: A Critic of Arguments'), Petitio principii, Probability and Chance, Syllogism
LOGIC / GRAND LOGIC 1893