The book consists of nine chapters. 1. The sources and Data of Principles of physical education... 2. Physical Education as Education... 3. Physical Education in a Democracy - Political Concept.... 4. Physical Education in a Democracy - Economic Concept... 5. Physical Education in a Democracy - Social Concept....6. The Nature of Man- His Biological Foundations......7. The Nature of Man- His psychological Foundations.......8. The Historic Role of Physical Education in the problem of Adjustment of life...9. The Curriculum