CONTENTS. 



LECTURE I. 



PAGE 

 THE FORCE OF GRAVITATION . . . . .1 



LECTURE II. 



GRAVITATION COHESION 31 



LECTURE III. 



COHESION CHEMICAL AFFINITY 58 



LECTURE IV. 



CHEMICAL AFFINITY HEAT . . ..*''* . $4 



LECTURE V. 



MAGNETISM ELECTRICITY 106 



LECTURE VI. 



THE CORRELATION OF THE PHYSICAL FORCES . .130 



LIGHTHOUSE ILLUMINATION THE ELECTRIC LIGHT . 155 

 NOTES 175 



