It would be hard to say whether it was the increased power of the tribunes which developed the authority of the comitia tributa, or whether it was the increased power of the comitia tributa which first gave to the tribunes the vast power which they were ultimately able to exercise in Rome. However this may be, the fact is evident that the power of the comitia tributa and of the tribunes rose together. At a later date, membership in the comitia tributa was not limited to the plebeians, but the influence of the patricians in this assembly was always inconsiderable and they generally absented themselves from its meetings. Although the wealthy classes had no predominating influence in the comitia tributa, its decision upon any question was far from being, necessarily, the decision of the majority. Measures submitted to the comitia tributa were carried or defeated by the vote of the majority of the tribes, and the numbers enrolled in each tribe were very unequal, all the inhabitants of the city of Rome being enrolled into four tribes, and a very disproportionate power being thus given to the rural voters. The meetings of the comitia tributa were generally presided over by a tribune, although sometimes by one of the consuls. At first the laws passed by the comitia tributa were required to be confirmed by a vote of the comitia centuriata, but this requirement was abolished in 339 B.C. by the Publilian and Horatian laws. The provisions of these laws were reaffirmed by the Hortensian laws in 286 B.C.; and it is certain that at least from this date the full validity of a law passed by the comitia tributa was never questioned. In the comitia centuriata and the comitia tributa we see the anomalous condition of two independent law-making assemblies; and as there was no division between them of the field of legislation, it is hard to see how, even with the controlling influence of the Senate, conflicts between the two were so generally avoided. So completely were the two comitiæ on an equality as to the validity of the laws enacted by each that the records generally fail to show by which assembly any particular law was passed, but this can generally be ascertained by looking at the name of the proposer of the law. If a tribune appears as the proposer of the law it was passed by the comitia tributa; but if the proposer was a consul, prætor, or dictator, the law was the work of the comitia centuriata.