CONTENTS. 



I. INTRODUCTION. 



ART. PAGE 



1. Energy and its Transformation i 



2. Forces and their Classification ...... 3 



3. Energy defined .7 



4. Mechanics defined 8 



5. Energetics defined ......... 8 



6. Relations of Matter, Force, and Energy . . . .10 



7. Laws of Energetics ........ 24 



8. Newton's Laws ......... 26 



9. Algebraic Expression of Energy-changes . . . .27 



10. The Object of all Mechanism 30 



11. The Sources and Kinds of Energy 31 



12. Forms of Motor 34 



II. THE ANIMAL AS A PRIME MOTOR. 



13. The Animal as a Machine 37 



14. The Animal as a Motor . 38 



15. The Processes of Vital Machines ...... 45 



16. The Efficiency of the Animal System 50 



17. The Work of the Animal Machine 50 



18. Work of Men and Animals 53 



ig. Effective Methods of Application of Power . . . i 59 



20. Draught of Vehicles 61 



21. Intensity of Muscular Effort 68 



22. The Uses of Food . 70 



23. Dietaries .......... 73 



24. Mechanism of Transmission of Force 78 



