In this small volume the author gives a brief exposition of England's experience with hours of work, work spells and rest pauses, shift systems, sickness and absenteeism, accidents and injuries, ventilation, heating and lighting of factories, and welfare and labor management in relation to munitions output in the World War and the early days of the present war. Throughout the volume the importance of maintaining the health of the munition workers is emphasized, although he gives no specific methods. He presents a good case, however, for certain limits of productive effort, at which best results in output can be obtained without impairment of health. Appearing on the threshold of our own national defense effort, this book has value to industrial physicians, but more particularly to industrial management.