Preface DAVID E. ROWE / Einstein's Allies and Enemies: Debating Relativity in Germany, 1916-1920. HELMUT PULTE / The Space between Helmholtz and Einstein: Moritz Schlick on Spatial Intuition and the Foundations of Geometry. DAVID HYDER / Kant, Helmholtz and the Determinacy of Physical Theory. ROBERT DISALLE / Mathematical Structure, 'World Structure,' and the Philosophical Turning-point in Modern Physics. ERHARDSCHOLZ/ The Changing Concept of Matter in H.Weyl's Thought, 1918 - 1930. LAWRENCE SKLAR / Why Does the Standard Measure Work in Statistical Mechanics? JESPER LU¨ TZEN / A Mechanical Image: Heinrich Hertz's Principles of Mechanics JEREMY GRAY / Enriques: Popularising Science and the Problems of Geometry. MICHEL JANSSEN AND MATTHEW MECKLENBURG / Electromagnetic Models of the Electron and the Transition from Classical to Relativistic Mechanics ULRICH MAJER / Hilbert's Axiomatic Approach to the Foundations of Science-a Failed Research Program? Index