PREFACE.
LECTURE I. THE FORCE OF GRAVITATION.
LECTURE II. GRAVITATION—COHESION.
LECTURE III. COHESION—CHEMICAL AFFINITY.
LECTURE IV. CHEMICAL AFFINITY—HEAT.
LECTURE V. MAGNETISM—ELECTRICITY.
LECTURE VI. THE CORRELATION OF THE PHYSICAL FORCES.
LECTURE ON LIGHT-HOUSE ILLUMINATION—THE ELECTRIC LIGHT.
NOTES.
