On the 300th anniversary of the consolidation of the metaphysical system of Leibniz in the Discours de metaphysique and the ensuing correspondence with Antoine Arnauld, it seemed fitting to reexamine the interaction of scientific and philosophical thought in the work of this great systematic thinker. Contributors to this volume, ublished as part of the Center for Philosophy of Science Series in Philosophy of Science include John Earman, Glenn Hartz, Emily Grosholz, Francois Duchesneau, Lois Frankel, Francis J. Kovach, Ulrich Majer, George Gale, Klaus Mainzer, Larry McCullough, John Leslie, Wolfgang Lenzen, Catherine Wilson, and Hans Burkhart. Co-published with the Center for Philosophy of Science.