Preface; 1. The classical physicist's approach to the subject; 2. The hereditary mechanism; 3. Mutations; 4. The quantum-mechanical evidence; 5. Delbruck's model discussed and tested; 6. Order, disorder and entropy; 7. Is life based on the laws of physics?; Epilogue: on determinism and free will; Mind and Matter: 1. The physical basis of consciousness; 2. The future of understanding; 3. The principle of objectivation; 4. The arithmetical paradox: the oneness of mind; 5. Science and religion; 6. The mystery of the sensual qualities; Autobiographical sketches (translated from the German by Schroedinger's granddaughter Verena).