The Psychology of Public Relations
cumstances an international flight will produce a spirit of good will, making possible even the consummation of political programs. But he cannot be sure that some unexpected event will not overshadow this flight in the public interest, or that some other aviator may not do something more spectacular the day before. Even in his restricted field of public psychology there must always be a wide margin of error. Propaganda, like economics and sociology, can never be an exact science for the reason that its subject-matter, like theirs, deals with human beings.
If you can influence the leaders, either with or without their conscious coöperation, you automatically influence the group which they sway. But men do not need to be actually gathered together in a public meeting or in a street riot, to be subject to the influences of mass psychology. Because man is by nature gregarious he feels himself to be member of a herd, even when he is alone in his room with the curtains drawn. His mind retains the patterns which have been stamped on it by the group influences.
A man sits in his office deciding what stocks to buy. He imagines, no doubt, that he is planning his purchases according to his own judgment. In actual fact his judgment is a mélange of impressions stamped on his mind by outside influences which unconsciously control his thought. He buys a certain railroad stock because it was in the headlines yesterday and hence is the one which comes most promi-
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