CONTENTS. 



PAGH 



PREFACE, ..... v 



INTRODUCTION, ...... xi 



THE CORRELATION OF PHYSICAL FORCES, BY W. B GROVE. 



Preface, ....... 3 



I. Introductory Remarks, .... 9 



H. Motion, . . . . . .25 



IE. Heat, 39 



iy._Electricity, . . . . . .83 



Y. Light, . . . . . .110 



VI. Magnetism, v . . . . .142 



VII. Chemical Affinity, . . . . 152 



VIH. Other Modes of Force, . . . .169 



IX. Concluding Remarks, . . . .178 



Notes and References, .... 200 



ON THE INTERACTION OF NATURAL FORCES, BY PROP. 



HELMHOLTZ, , . . . .211 



REMARKS ON THE FORCES OF INORGANIC NATURE, By DR. 



J. R. MAYER, ... .251 



