Du Bois Reymond to express a certain electric condition of the nerves,
and Professor Clerk Maxwell has ably defined and illustrated the
hypothesis in the Tenth Volume of the 'Transactions of the Cambridge
Philosophical Society.'

The mere approach of a wire forming a closed curve to a second wire
through which a voltaic current flowed was then shown by Faraday to
be sufficient to arouse in the neutral wire an induced current,
opposed in direction to the inducing current; the withdrawal of the
wire also generated a current having the same direction as the
inducing current; those currents existed only during the time of
approach or withdrawal, and when neither the primary nor the
secondary wire was in motion, no matter how close their proximity
might be, no induced current was generated.

Faraday has been called a purely inductive philosopher. A great deal
of nonsense is, I fear, uttered in this land of England about
induction and deduction. Some profess to befriend the one, some the
other, while the real vocation of an investigator, like Faraday,
consists in the incessant marriage of both. He was at this time full
of the theory of Ampere, and it cannot be doubted that numbers of
his experiments were executed merely to test his deductions from
that theory. Starting from the discovery of Oersted, the illustrious
French philosopher had shown that all the phenomena of magnetism
then known might be reduced to the mutual attractions and repulsions
of electric currents. Magnetism had been produced from electricity,
and Faraday, who all his life long entertained a strong belief in
such reciprocal actions, now attempted to effect the evolution of
electricity from magnetism. Round a welded iron ring he placed two
distinct coils of covered wire, causing the coils to occupy opposite