chapter XIV., "The Progress of Electricity from Gilbert and Von

Guericke to Franklin," p. 259 _seq._

Vol. III., chapter VII., "The Modern Development of Electricity and Magnetism," p. 229 _seq._

Vol. V., p. 92 _seq._, the section on Prof. J. J. Thompson and the nature of electricity.

Other chapters that may be advantageously reviewed in connection with the present one are the following:

Vol. III., chapter VI., "Modern Theories of Heat and Light," p. 206 _seq._; chapter VIII., "The Conservation of Energy," p. 253 _seq._; and