T. Hailperin, Sentential Probability Logic. Origins, Development, Current Status, and Technical Applications. Bethlehem:Lehigh University Press, London: Associated University Presses, 1996. 168 pp. $35.00 Antoine Arnauld and Pierre Nicole, Logic or the art of thinking, Translated and edited by Jill Vance Buroker. Cambridge:Cambridge University Press, 1996. xxxviii + 281 pp. $54.95 (hbk), $18.95 (pbk). ISBN 0-521-48249-6/-48394-8