Chapter 7.
Origin of power in the voltaic pile.

Chapter 8.
Researches on frictional electricity: induction: conduction:
specific inductive capacity: theory of contiguous particles.

Chapter 9.
Rest needed--visit to Switzerland.

Chapter 10.
Magnetization of light.

Chapter 11.
Discovery of diamagnetism--researches on magne-crystallic action.

Chapter 12.
Magnetism of flame and gases--atmospheric magnetism.

Chapter 13.
Speculations: nature of matter: lines of force.

Chapter 14.
Unity and convertibility of natural forces: theory of the
electric current.

Chapter 15.
Summary.