This three volume work was originally designed for a two-year introductory physics course given at the California Institute of Technology a course designed to take advantage of readers' increasing mathematical prowess and to provide a more comprehensive view of modern-day physics. The volumes are an edited version of Richard Feynman's lectures, taped and transcribed specifically for the books. Feynman's effective classroom style remains intact in these volumes, a valuable work by a remarkable educator. It is a rigorous undertaking that resulted in a classic reference work for anyone interested in physics.