CONTENTS 1. Classification of Solids 2. Lattice Vibrations and Lattice Specific Heat 3. Equilibrium Properties of a Free-electron Gas 4. Electrons in a Periodic Lattice 5. Transport Equation 6. Relaxation Mechanisms 7. Conductivity and Related Metals 8. Homogeneous Semiconductors 9. Rectifying Junctions and Transistors 10. Optical Properties of Semiconductors 11. Properties of Semiconductors and Metals in Strong Magnetic Fields Appendix Summary of Elementary Quantum Mechanics Appendix Units and Conversion Factors Appendix The Periodic Table Appendix Values of Important Physical Constants and Some Convenient Conversion Factors Appendix List of Symbols