The professionalism shown by the author throughout the text is inviting us to look with open eyes to the perspectives opened by the enlargement of the field objects with which we are operating.

• PART I: INTRODUCTION AND GENERAL FORMALISM 1: Introduction 2: General Framework of Quaternionic Quantum Mechanics 3: Further General Results in Quaternionic Quantum Mechanics PART II: NON-RELATIVISTIC QUATERNIONIC QUANTUM MECHANICS 4: One-Particle Quantum Mechanics--General Formalism 5: Stationary State Methods and Phase Methods 6: Scattering Theory and Bound States 7: Methods for Time-Development 8: Single Channel Time-Dependent Formal Scattering Theory 9: Multi-Particle and Multi-Channel Methods 10: Further Multi-Particle Topics PART III: RELATIVISTIC QUATERNIONIC QUANTUM MECHANICS 11: Relativistic Single Particle Wave Equations Spin-0 and Spin-1/2 12: More on Relativistic Wave Equations: The Spin-1 Gauge Potential, Lagrangian Formulations, and the Poincare Group 13: Quaternionic Quantum Field Theory 14: Outlook Appendix A: Proof of the Jacobi Identity for the Generalized Poisson Bracket Appendix B: Derivation of Gaussian Integral Formulas