The contributions to volume 8 of the Internationales Jahrbuch des Deutschen Idealismus/International Yearbook of German Idealism pursue from various perspectives the multifarious relations of German Idealism to the natural sciences and mathematics. The concepts of nature and of the basis for mathematics develop complexly in German philosophy after Kant. At issue are: the foundation of mathematics; the relation of freedom to nature; the significance of philosophy to emerging research in biology, chemistry, and physics, and reconsideration of the thought of Leibniz and Spinoza. Contributors: Gideon Freudenthal, Michael Friedman, Hans-Peter Neumann, Wolfgang Neuser, Konstantin Pollok, Sebastian Rand, Pirmin Stekeler-Weithofer, Thomas Sturm, Lars-Thade Ulrichs, Eric Watkins, John Zammito, Paul Ziche, Rachel Zuckert