Preface - Instead of a `Festschrift'; A. Amann, et al. The Primas Effect: On Quanta and Beyond; U. Müller-Herold. Hans Primas and Nuclear Magnetic Resonance; R.R. Ernst. Fragments of an Algebraic Quantum Mechanics Program for Theoretical Chemistry; A. Amann, U. Müller-Herold. Matter. C*- and W*-Algebras of Observables, Their Interpretations, and the Problem of Measurement; A. Amann, H. Atmanspacher. Temporal Nonlocality; G. Mahler. Macroscopic Purification of States by Interactions; H. Narnhofer, W. Thirring. Macroscopic Quantum Phenomena at the SQUID; A. Rieckers. The Geometry of Quantum Probabilities; K. Gustafson. Probability and Quantum Dynamics; E.C.G. Sudarshan. Perspectives on the Molecular Microworld; D.H. Rouvray. The Science of Matter: Fascination and Limits; C.P. Enz. Mind. Holism; A. Shimony. Concepts of Reality: Primas' Nonstandard Realism; B. d'Espagnat. Relative Onticity; H. Atmanspacher, F. Kronz. Rationalism, Determinism, Freedom; V. Hösle. Cuts and Symbols; W. Just. Reflections on the Foundations of Quantum Theory; C.F. von Weizsäcker. Appendices. Publications by Hans Primas (until 1998). List of Contributors. Index.