It is difficult to understand history, and popular revolutions in particular, if one does not take sufficiently into account the profoundly conservative instincts of crowds. They may be desirous, it is true, of changing the names of their institutions, and to obtain these changes they accomplish at times even violent revolutions, but the essence of these institutions is too much the expression of the hereditary needs of the race for them not invariably to abide by it. Their incessant mobility only exerts its influence on quite superficial matters. In fact they possess conservative instincts as indestructible as those of all primitive beings. Their fetish- like respect for all traditions is absolute; their unconscious horror of all novelty capable of changing the essential conditions of their existence is very deeply rooted. Had democracies possessed the power they wield to-day at the time of the invention of mechanical looms or of the introduction of steam-power and of railways, the realisation of these inventions would have been impossible, or would have been achieved at the cost of revolutions and repeated massacres. It is fortunate for the progress of civilisation that the power of crowds only began to exist when the great discoveries of science and industry had already been effected. 5. THE MORALITY OF CROWDS. Taking the word "morality" to mean constant respect for certain social conventions, and the permanent repression of selfish impulses, it is quite evident that crowds are too impulsive and too mobile to be moral. If, however, we include in the term morality the transitory display of certain qualities such as abnegation, self-sacrifice, disinterestedness, devotion, and the need of equity, we may say, on the contrary, that crowds may exhibit at times a very lofty morality. The few psychologists who have studied crowds have only considered them from the point of view of their criminal acts, and noticing how frequent these acts are, they have come to the conclusion that the moral standard of crowds is very low.