This book is made up of many maxims and quotations which outline the development and present-day uses of the x-rays and radium in the diagnosis and treatment of disease. The subject matter is divided into early history and physics, roentgen diagnosis and radiation therapy. It refreshes one's memory as to the uses and accuracy of the x-rays and radium in diagnosis and treatment. Many of the quotations portray the rapid advance of the x-rays in the various specialties. This book virtually constitutes an outline of the development and present status of the x-rays and radium, and should be read by every physician.