Preface / Genesis / Foundations / Symmetry and Conservation Laws / Energy, Momentum and Angular Momentum / Quantum Mechanics of Photon and Neutrino / Passage from Quantum to Classical Mechanics / Solution of Schrödinger Equation / The Hydrogen Atom / Perturbation Theory / Electron Spin and Hydrogen Fine Structure / Identical Particles / The Helium Atom / Emission and Absorption of Photons by Atoms / Scattering of Photons by Atoms / Lamb Shift / Theory of Scattering / Phase of the Wavefunction / Lagrangian Formulation of Quantum Mechanics / Paradoxes in Quantum Mechanics / Appendix-A / Appendix-B / Subject Index / Author Index