I. Between Rationalism and Empiricism.- I.l Remarks on the Concept of Cause (1969).- 31.2 Aspects of Wholeness in Science and Philosophy (1987).- 61.3 Kant's Apriorism and Some Modern Positions (1988).- 41.4 C. F. von Weizsiicker and the Unity of Physics (1993).- 91.5 Between Rationalism and Empiricism: The Path of Physics (1994).- II. The Philosophy of the Physicists.- II.6 The Physicists' Conception of Progress (1988).- II.7 Erwin Schrodinger and the Philosophy of the Physicists (1991).- II.8 Albert Einstein: Theory, Experience, Reality (1992).- II.9 Heisenberg's Concept of a Closed Theory (1993).- II.lO The Origin of Scientific Realism: Boltzmann, Planck, Einstein (1995).- III. Reconstruction.- III.l1 On the Structure of Physical Theories (1979).- III.l2 A Comparison of Two Recent Views on Theories (1982).- III.13 Towards a Rehabilitation of Reconstructionism (1984).- III.l4 Paul Feyerabend and Rational Reconstructions (1988).- IV. Laws of Nature.- IV.15 Coherence and Contingency. Two Neglected Aspects of Theory Succession (1989).- IV.16 Predication and Physical Law (1991).- IV.17 Substances, Physical Systems, and Quantum Mechanics (1991).- IV.18 General Laws of Nature and the Uniqueness of the Universe (1991).- IV.19 On Limitations of Physical Knowledge (1998).- V. Reduction.- V.20 The Explanation of Kepler's Laws (1973).- V.21 Are There Explanations of Theories? (1976).- V.22 A Case Study Concerning the Limiting Case Relation in Quantum Mechanics (1981).- V.23 A New Theory of Reduction in Physics (1993).- V.24 The Rationality of Reductionism (1995).- VI. Foundations of Quantum Mechanics.- VI.25 Quantum Logic and Some Aspects of Logic in General (1985).- VI.26 What Kind of Hidden Variables Are Excluded by Bell's Inequality? (1986).- VI.27 The Copenhagen School and Its Opponents (1990).- VI.28 J. von Neumann's and J. S. Bell's Theorem. A Comparison (1991).- VI. 29 EPR-Situation and Bell's Inequality (1991).- VI.30 Three Remarks Concerning Bell's Inequality (1993).- VII. Spacetime, Invariance, Covariance.- VII.31 Invariance and Covariance (1982).- VII.32 Hermann Weyl and the Nature of Spacetime (1988).- VII. 33 Covariance and the Non-Preference of Coordinate Systems (1991).- VII.34 A Most General Principle of Invariance (1994).- VIII. Mathematics and Physics.- VIII.35 Kant's Philosophy of Mathematics (1977).- VIII.36 Mathematics and Physical Axiomatization (1986).- VIII.37 Calculemus! The Problem of the Application of Logic and Mathematics (1988).- VIII.38 The Mathematical Overdetermination of Physics (1997).- Acknowledgements.- Literature.