Summing up the history of the Convention in another chapter, we shall see how frequent were these irruptions, and with what servility the Assembly, which according to the legends was so powerful bowed itself before the most imperative injunctions of a handful of rioters. Instructed by experience, the Directory closed the clubs and put an end to the invasion of the populace by energetically shooting them down. The Convention had early grasped the superiority of homogeneous groups over heterogeneous assemblies in matters of government, which is why it subdivided itself into committees composed each of a limited number of individuals. These committees--of Public Safety, of Finance, &c.--formed small sovereign assemblies in the midst of the larger Assembly. Their power was held in check only by that of the clubs. The preceding considerations show the power of groups over the wills of the members composing them. If the group is homogeneous, this action is considerable; if it is heterogeneous, it is less considerable but may still become important, either because the more powerful groups of an assembly will dominate those whose cohesion is weaker or because certain contagious sentiments will often extend themselves to all the members of an assembly. A memorable example of this influence of groups occurred at the time of the Revolution, when, on the night of the 4th of August, the nobles voted, on the proposition of one of their members, the abandonment of feudal privileges. Yet we know that the Revolution resulted in part from the refusal of the clergy and the nobles to renounce their privileges. Why did they refuse to renounce them at first? Simply because men in a crowd do not act as the same men singly. Individually no member of the nobility would ever have abandoned his rights. Of this influence of assemblies upon their members Napoleon at St. Helena cited some curious examples: ``Nothing was more common than to meet with men at this period quite unlike the reputation that their acts and words would seem to justify. For instance, one might have supposed Monge to be a terrible fellow; when war was decided upon he mounted the tribune of the Jacobins and declared that he would give his two daughters to the two first soldiers to be wounded by the enemy. He wanted the nobles to be killed, &c. Now, Monge was the most gentle and feeble of men, and wouldn't have had a chicken killed if he had had to do it with his own hands, or even to have it done in his presence.'' 3. A Suggested Explanation of the Progressive Exaggeration of Sentiments in Assemblies. If collective sentiments were susceptible of exact quantitative measurement, we might translate them by a curve which, after a first gradual ascent, runs upward with extreme rapidity and then falls almost vertically. The equation of this curve might be called the equation of the variations of collective sentiments subjected to a constant excitation.