Dr. Otto Glasser and his collaborators, of whom there were twenty-five, limited themselves essentially to contributions of American co-workers, preserving the individuality of the contributions and making alterations only to maintain uniformity in the text. This work was ably done and, considering the size of the book, many notable achievements and valuable data have been crowded into its pages. The contributing editors were carefully selected, their names being sufficient warranty to assure quality consistent with conciseness. The chapters deal with historical sketches of Wilhelm Conrad Roentgen, the Curies, American pioneers, radiologic societies, physics of radium and roentgen rays, apparatus, dosimetry, radiologic diagnosis, military roentgenology, radium and roentgen therapy, biologic effects, protection, teaching of radiology, cosmic rays, and the Gurwitsch rays. All the chapters are written in such a way as not to become tedious. Every radiologist or allied worker should possess a copy, especially for its historical value.