Many general practitioners have lately come to feel that they need to know more of the fundamental matters of the indications for the application of the various modalities employed in physical therapy. Nothing has been written which fills the need so well as this small volume. More than fifty pages added in this edition includes a conservative discussion of the use and indications for ultraviolet radiation and diathermy. The extravagant claims found in many articles and books have prejudiced conservative physicians against physical treatment. The present volume helps to overcome this prejudice. The chapters devoted to heart disease, vasomotor disorders, respiratory diseases, the treatment of abdominal conditions, arthritis and the commoner injuries to the muscles, bones and joints are conservative. Explicit directions are given for the application of massage, heat, passive and resisted movements, and exercises for the restoration of function after all the commoner fractures.