Closely following this idea of the universality of vibrations, and intimately connected therewith, we have the principle of "induction," which is likewise universal, and found manifesting on all planes of energy. "What is induction?" you may ask. Well, it is very simple, or very complex--just as you may look at it. The principle of induction (on any plane) is that inherent quality or attribute of energy by which the manifestation 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 'revival' excitement or fervor."