In order, therefore, to understand the limitations of the drama as an art, and clearly to define its scope, it is necessary to inquire into the psychology of theatre audiences. This subject presents two phases to the student. First, a theatre audience exhibits certain psychological traits that are common to all crowds, of whatever kind,--a political convention, the spectators at a ball-game, or a church congregation, for example. Second, it exhibits certain other traits which distinguish it from other kinds of crowds. These, in turn, will be considered in the present chapter. II By the word _crowd_, as it is used in this discussion, is meant a multitude of people whose ideas and feelings have taken a set in a certain single direction, and who, because of this, exhibit a tendency to lose their individual self-consciousness in the general self-consciousness of the multitude. Any gathering of people for a specific purpose--whether of action or of worship or of amusement--tends to become, because of this purpose, a _crowd_, in the scientific sense. Now, a crowd has a mind of its own, apart from that of any of its individual members. The psychology of the crowd was little understood until late in the nineteenth century, when a great deal of attention was turned to it by a group of French philosophers. The subject has been most fully studied by M. Gustave Le Bon, who devoted some two hundred pages to his _Psychologie des Foules_. According to M. Le Bon, a man, by the mere fact that he forms a factor of a crowd, tends to lose consciousness of those mental qualities in which he differs from his fellows, and becomes more keenly conscious than before of those other mental qualities in which he is at one with them. The mental qualities in which men differ from one another are the acquired qualities of intellect and character; but the qualities in which they are at one are the innate basic passions of the race. A crowd, therefore, is less intellectual and more emotional than the individuals that compose it. It is less reasonable, less judicious, less disinterested, more credulous, more primitive, more partisan; and hence, as M. Le Bon cleverly puts it, a man, by the mere fact that he forms a part of an organised crowd, is likely to descend several rungs on the ladder of civilisation. Even the most cultured and intellectual of men, when he forms an atom of a crowd, tends to lose consciousness of his acquired mental qualities and to revert to his primal simplicity and sensitiveness of mind.