Chapter III: Preface: , vii

CHAPTER

I.--WHAT IS ENERGY? 1

II.--MECHANICAL ENERGY AND ITS CHANGE INTO HEAT, 23

III.--THE FORCES AND ENERGIES OF NATURE: THE LAW OF CONSERVATION, 48

IV.--TRANSMUTATIONS OF ENERGY, 87

V.--HISTORICAL SKETCH: THE DISSIPATION OF ENERGY, 131

VI.--THE POSITION OF LIFE, 154

APPENDIX

I.--CORRELATION OF VITAL WITH CHEMICAL AND PHYSICAL FORCES.
By JOSEPH LE CONTE, Professor of Geology and Natural
History in the University of California, 171

II.--CORRELATION OF NERVOUS AND MENTAL FORCES. By ALEXANDER
BAIN, Professor of Logic and Mental Philosophy in
the University of Aberdeen, 205

THE CONSERVATION OF ENERGY.