ion of energy tends to reproduce itself in a second object, by
setting up corresponding vibrations therein, though without direct contact
of the two objects.

Thus, heat in one object tends to induce heat in another object within
its range of induction--the heated object "throws off" heat vibrations
which set up corresponding vibrations in the near-by second object and
make it hot. Likewise, the vibrations of light striking upon other objects
render them capable of radiating light. Again, a magnet will induce
magnetism in a piece of steel suspended nearby, though the two objects do
not actually touch, each other. An object which is electrified will by
induction electrify another object situated some distance away. A note
sounded on the piano, or violin, will cause a glass or vase in some
distant part of the room to vibrate and "sing," under certain conditions.
And, so on, in every form or phase of the manifestation of energy do we
see the principle of induction in full operation and manifestation.

On the plane of ordinary thought and emotion, we find many instances of
this principle of induction. We know that one person vibrating strongly
with happiness or sorrow, cheerfulness or anger, as the case may be fends
to communicate his feeling and emotions, state to those with whom he comes
in contact. All of you have seen a whole room full of persons affected and
influenced in this way, under certain circumstances. You have also seen
how a magnetic orator, preacher, singer or actor is able to induce in his
audience a state of emotional vibration corresponding to that manifested
by himself. In the same manner the "mental atmospheres" of towns, cities,
etc., are induced.

A well-known writer on this subject has truthfully told us: "We all know
how great waves of feeling spread over a town, city or country, sweeping
people off their balance. Great waves of political enthusiasm, or
war-spirit, or prejudice for or against certain persons, sweep over places
and cause men to act in a manner that they will afterward regret when they
come to themselves and consider their acts in cold blood. They will be
swayed by demagogues or magnetic leaders who wish to gain their votes or
patronage; and they will be led into acts of mob violence, or similar
atrocities, by yielding to these waves of contagious thought. On the other
hand, we all know how great waves of religious feeling sweep over a
community upon the occasion of some great 'reviv