In 415, the law of Q. Publilius Philo took from the Senate the power of refusing the _auctoritas_ to the laws voted by the comitia, and obliged it to declare in advance if the proposed law were in conformity with public and religious law. Further, the obligation imposed by this law of having always one censor taken from among the plebeians, opened the doors of the Senate to the richest of them, since it was the business of the censor to fix the rank of the citizens, and pronounce on the admission or exclusion of the senators. The Publilian law thus tended to raise the aristocracy of the two orders to the same rank, and to create the nobility (_nobilitas_), composed of all the families rendered illustrious by the offices they had filled. [Sidenote: Elements of Dissolution.] IV. At the beginning of the fifth century of Rome, the bringing nearer together of the two orders had given a greater consistence to society; but, just as we have seen under the kingly rule, the principles begin to show themselves which were one day to make the greatness of Rome, so now we see the first appearance of dangers which will be renewed unceasingly. Electoral corruption, the law of perduellio, slavery, the increase of the poor class, the agrarian laws, and the question of debts, will come, under different circumstances, to threaten the existence of the Republic. Let us summarily state that these questions, so grave in the sequel, were raised at an early date. ELECTORAL CORRUPTION.--Fraud found its way into the elections as soon as the number of electors increased and rendered it necessary to collect more suffrages to obtain public charges; as early as 396, indeed, a law on solicitation, proposed by the tribune of the people, C. Pœtelius, bears witness to the existence of electoral corruption. LAW OF HIGH-TREASON.--As early as 305 and 369, the application of the law of perduellio, or design against the Republic, furnished to arbitrary power an arm of which, at a later period, under the emperors, so deplorable a use was made under the name of the law of high-treason.[122] SLAVERY.--Slavery presented serious dangers for society, for, on the one hand, it tended, by the lower price of manual labour, to substitute itself for the labour of free men; while, on the other, discontented with their lot, the slaves were always ready to shake off the yoke and become the auxiliaries of all who were ambitious. In 253, 294, and 336, partial insurrections announced the condition already to be feared of a class disinherited of all the advantages, though intimately bound up with all the wants, of ordinary life.[123] The number of slaves increased rapidly. They replaced the free men torn by the continual wars from the cultivation of the land. At a later period, when these latter returned to their homes, the Senate was obliged to support them by sending as far as Sicily to seek wheat to deliver to them either gratis or at a reduced price.[124]