Broad, C. D. Leibniz's Predicate-in-notion Principle And Some Of Its Alleged Consequences.--couturat, L. On Leibniz's Metaphysics.--friedrich, C. J. Philosophical Reflections Of Leibniz On Law, Politics, And The State.--curley, E. M. The Root Of Contingency.--hacking, I. Individual Substance.--hintikka, J. Leibniz On Plenitude, Relations, And The Reign Of Law.--ishiguro, H. Leibniz's Theory Of The Ideality Of Relations.--kneale, M. Leibniz And Spinoza On Activity.--koyré, A. Leibniz And Newton.--lovejoy, A. O. Plenitude And Sufficient Reason In Leibniz And Spinoza.--mates, B. Leibniz On Possible Worlds.--russell, B. Recent Work On The Philosophy Of Leibniz.--wilson, M. D. On Leibniz's Explication Of Necessary Truth. Edited By Harry G. Frankfurt. Reprint Of The 1st Ed. Published By Anchor Books, Garden City, N.y., In Series: Modern Studies In Philosophy. Bibliography: P. [421]-425.