Beschreibung:

i. A treatise on the calculus of finite differences. Cambridge: Macmillan, 1860, FIRST EDITION, 8vo, original cloth, (bought from B. & L. Rootenberg, Sherman Oaks, CA, 1987), [T&W B201; Origins of Cyberspace 226], contents slightly shaken, hinges splitting, extremities slightly bumped ii. The mathematical analysis of logic. New York: Philosophical Library, 1948, 8vo, facsimile of 1847 edition, original cloth, [T&W B199 bis], slight browning iii. Studies in logic and probability. La Salle, Illinois: Open Court, 1952, 8vo, original cloth, dust-jacket, [T&W B200], front free endpaper clipped