The very fact of the concentration acts as an exceptionally powerful stimulant. When they are once come together, a sort of electricity is formed by their collecting which quickly transports them to an extraordinary degree of exaltation. Every sentiment expressed finds a place without resistance in all the minds, which are very open to outside impressions ; each re-echoes the others, and is re-echoed by the others. The initial impulse thus proceeds, growing as it goes, as an avalanche grows in its advance. And as such active passions so free from all control could not fail to burst out, on every side one sees nothing but violent gestures, cries, veritable howls, and deafening noises of every sort, which aid in intensifying still more the state of mind which they manifest. And since a collective sentiment cannot express itself collectively except on the condition of observing a certain order permitting co-operation and movements in unison, these gestures and cries naturally tend to become rhythmic and regular ; hence come songs and dances. But in taking a more regular form, they lose nothing of their natural violence ; a regulated tumult remains tumult.