I Transformation Theory.- 1 Introduction.- 2 Transformations in Space.- 3 Transformations in Space-Time.- 4 Boson Wave Equations.- 5 Spin-¿ Dirac Equation.- 6 Discrete Symmetries.- II Scattering Theory.- 7 Formal Theory of Scattering.- 8 Simple Scattering Dynamics.- 9 Nonrelativistic Perturbation Theory.- III Covariant Feynman Diagrams.- 10 Covariant Feynman Rules.- 11 Lowest-Order Electromagnetic Interactions.- 12 Low-Energy Strong Interactions.- 13 Lowest-Order Weak Interactions.- 14 Lowest-Order Gravitational Interactions.- 15 Higher-Order Covariant Feynman Diagrams.- Problems.- Appendices.- I Units and Conventions.- 1. Units.- 3. Normalizations.- 4. Decay Rates and Cross Sections.- 5. Covariant Integrals and Feynman Parametrization.- II Rotation-Group Formulae.- III Elementary-Particle Zoo.- Books.- Research Articles.