[C.S. Peirce] shared his father's views on slavery and on the war. He liked to use the syllogism: "All Men are equal in their political rights. Negroes are Men ∴Negroes are equal in political rights to whites" to illustrate the unreliability of traditional forms of logic.
— Louis Menand, The Metaphysical Club ‎· сторонник жёсткого шоколада