Kant, Helmholtz and the Determinacy of Physical Notes.- A Mechanical Image: Heinrich Hertz's Principles of Mechanics.- From Classical to Relativistic Mechanics: Electromagnetic Models of the Electron.- Enriques: Popularising Science and the Problems of Geometry.- Hilbert's Axiomatic Approach to the Foundations of Science-A Failed Research Program?.- The Space between Helmholtz and Einstein: Moritz Schlick on Spatial Intuition and the Foundations of Geometry.- Mathematical Structure, "World Structure," and the Philosophical Turning-Point in Modern Physics.- Einstein's Allies and Enemies: Debating Relativity in Germany, 1916-1920.- The Changing Concept of Matter in H.Weyl's Thought, 1918-1930.- Why Does the Standard Measure Work in Statistical Mechanics?.
