Primus Sermo, Secundus Sermo, Tertius Sermo On the role of Negation and on the Paradox: the three Phases of Speech. Originally written for Magna Carta Latina (1967 and 1975), 1955 (ca.). 6 pp. Rauner Library, Dartmouth College. Unpublished. Reel 9, Item 486. – 1955