THE SMALLEST WORKERS
In connection with this chapter the reader will do well to review
various earlier portions of the work outlining the general history of
the growth of knowledge of electricity and magnetism. For example:
Vol. II., p. 111 _seq._, for an account of William Gilbert's study
of magnetism; pp. 213, 215 describing first electrical machine; and
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
chapter IX., "The Ether and Ponderable Matter," p. 283 _seq._