A well known American writer on this subject has said concerning this point: "There are many places today filled with the thought-vibrations of minds long since passed out of the body. There are places filled with the strong vibrations of tragedies long since enacted there. Every place has a mental atmosphere of its own, the same arising from the thought-vibrations set in motion by the various persons who have inhabited or occupied them. Every city has its own mental atmosphere which has its effect upon persons moving into them. Some are lively, some dull, some progressive, some old-fogyish, some moral, some immoral—the result of the character of the early settlers and leading spirits, of the place in question. Persons moving into these towns are affected by the mental atmospheres thereof, and either sink to the general level, or else, if strong enough, help to change the mental tone of the place. Sometimes a change in conditions bring a large influx of new people, to a town, and the mental waves of the newcomers tend to bring about a marked change in the local mental atmosphere. These facts have been noticed by many observing people who often have not been familiar with the principles underlying and producing the facts which the observers have so clearly discerned."

The Contagion of Thought.

The same writer says, along the same general lines: "Many have of course noticed the differing mental atmospheres of stores, offices, and other places of business. Some of such places give one an air of confidence and trust; others create a feeling of suspicion and distrust; some convey an impression of active, wideawake management, while others impress one as being behind the times, and suffering from a want of alert, active management. These differing mental atmospheres are caused by the different prevailing mental attitudes of the owners of the respective establishments. The managers of business places send forth thought-waves of their own, and their employees naturally falling into the pace set for them also send forth similar vibrations, and before long the whole place is vibrating on a certain scale. A change of management soon produces a marked change in the entire mental atmosphere of the place. In the same way, we notice the mental atmospheres of the houses we happen to visit; in this way we become conscious of an entire mental scale of many notes, the notes being sounded unconsciously by the minds of the occupants of the houses. From some thresholds radiate harmony, while others breathe the spirit of inharmony. Some radiate emotional warmth, while others chill one like an iceberg, by reason of the emotional coldness of the dwellers therein. Likewise, the low quarters of our cities, the dens of vice, and the haunts of dissipation vibrate with the character of the thought and feeling of those inhabiting them. And, often, the weak-willed visitor is thus tempted. In the same way, certain other places are charged with the vibrations of strong, helpful, elevating mental states, which tend to lift up and elevate, energize and stimulate the minds and feelings of those visiting these places. Thought and feeling are contagious, by reason of the laws of mental vibration and mental induction."

Mental Whirlpools.

The contagion of thought-vibrations is manifested by such vibrations coming into contact with the minds of other persons within the field of mental induction of the first person, and there setting up similar vibrations. We know that orators, actors, preachers and others addressing audiences of persons, send forth strong mental currents which tend to awaken corresponding vibrations in the minds of their hearers. We weep, smile, grow angry, feel happy, according to the character of the thought-waves, of the person on the platform or the stage, providing that we accept the same. And, according to the same principle, persons scattered over large areas are influenced and affected in the same way by whirlpools of mental vibrations set into original motion by some strong, masterful public man. A writer has said concerning this point:

Mental Tidal Waves

"We know how great waves of feeling spread over a town, city, or county, sweeping people off their feet, and causing them to lose their balance. Great waves of political enthusiasm, or war-spirit or prejudice for or against certain people, or groups of people, sweep over places and cause men to act in a manner which they afterward often regret when they come to themselves and consider the matter in the light of cold reason. People are swayed by demagogues or magnetic leaders who wish to capture their votes or patronage; and they are often led into acts of mob violence, or similar atrocities, by yielding to these waves of contagious thought. On the other hand, we know equally well how great waves of religious emotion spread out over the community upon the occasion of some great 'revival' excitement or religious fervor."

Immunity to Thought Influences

Persons becoming acquainted for the first time with the above recited facts of mental vibrations, mental currents, mental waves, and mental contagion, frequently raise the objection that if all this be true, why are we not constantly swept off of our feet by these great waves of mental vibrations, whereas, in fact, we are seldom or never aware of them? The question is a natural one, and is capable of a satisfactory answer. In the first place, many of these mental currents neutralize each other, and thus both cease to exert any marked effect. And again, most persons are really "immune" to most of the thought waves reaching them, this by reason of the protective resistive power bestowed by Nature, and acquired during the evolution of the race.

To understand this, we have but to think of our immunity to the great majority of sounds and sights on the streets of a busy city. On a busy street corner, we are assailed by an infinitude of sounds and sights—but we hear but few of these, and see still fewer. The rest of these impressions are lost to us, although we have ears to hear and eyes to see. We hear and see only those impressions which are strong enough to awaken our attention. In the same way we fail to perceive the numerous thought vibrations and mental currents constantly surrounding us, and our attention is attracted and awakened by those sufficiently strong and vigorous to awaken our attention. The analogy is a very close one, and the understanding of one set of phenomena gives us the key to the other.