Consists of the text of Einstein's Stafford Little Lectures, delivered in May, 1921 at Princeton University. Includes an appendix discussing advances in the theory of relativity since 1921, and an appendix on his Generalized Theory of Gravitation.

The text of the first edition was translated by Edwin Plimpton Adams ; Appendix I by Ernst G. Straus ; Appendix II by Sonja Bargmann. Includes index.

Space and time in pre-relativity physics -- The theory of special relativity -- The general theory of relativity -- The generaly theory of relativity (continued) -- Appendix for the second edition -- Appendix II Relativistic theory of the non-symmetric field.