For individuals to succumb to contagion their simultaneous presence on the same spot is not indispensable. The action of contagion may be felt from a distance under the influence of events which give all minds an individual trend and the characteristics peculiar to crowds. This is especially the case when men's minds have been prepared to undergo the influence in question by those remote factors of which I have made a study above. An example in point is the revolutionary movement of 1848, which, after breaking out in Paris, spread rapidly over a great part of Europe and shook a number of thrones. Imitation, to which so much influence is attributed in social phenomena, is in reality a mere effect of contagion. Having shown its influence elsewhere, I shall confine myself to reproducing what I said on the subject fifteen years ago. My remarks have since been developed by other writers in recent publications. "Man, like animals, has a natural tendency to imitation. Imitation is a necessity for him, provided always that the imitation is quite easy. It is this necessity that makes the influence of what is called fashion so powerful. Whether in the matter of opinions, ideas, literary manifestations, or merely of dress, how many persons are bold enough to run counter to the fashion? It is by examples not by arguments that crowds are guided. At every period there exists a small number of individualities which react upon the remainder and are imitated by the unconscious mass. It is needful however, that these individualities should not be in too pronounced disagreement with received ideas. Were they so, to imitate them would be too difficult and their influence would be nil. For this very reason men who are too superior to their epoch are generally without influence upon it. The line of separation is too strongly marked. For the same reason too Europeans, in spite of all the advantages of their civilisation, have so insignificant an influence on Eastern people; they differ from them to too great an extent. "The dual action of the past and of reciprocal imitation renders, in the long run, all the men of the same country and the same period so alike that even in the case of individuals who would seem destined to escape this double influence, such as philosophers, learned men, and men of letters, thought and style have a family air which enables the age to which they belong to be immediately recognised. It is not necessary to talk for long with an individual to attain to a thorough knowledge of what he reads, of his habitual occupations, and of the surroundings amid which he lives."[17] [17] Gustave le Bon, "L'Homme et les Societes," vol. ii. p. 116. 1881.