CONTENTS. 



FAGB 



PREFACE, ..... v 



INTRODUCTION, . . xi 



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



Preface, ....... 3 



I. Introductory Remarks, .... 9 



n. Motion, . . .25 



HI. Heat, 39 



IV. Electricity, 83 



V. Light, 110 



VI. Magnetism, ...... 142 



VIL Chemical Affinity, .... 152 



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



IX. Concluding Remarks, . . . .178 



Notes and References, . . . . .200 



ON THE INTERACTION OF NATURAL FORCES, BY PROF. 



HELMHOLTZ, , . . . .211 



REMARKS ON THE FORCES OF INORGANIC NATURE, By DR. 



J. R. MAYER, 251 



