The study of the centuriate assembly begun earlier in the volume[1259] and continued in the preceding part of this chapter shows it gradually developing its organization during the fifth and fourth centuries B.C. The main line of progress has been traced though details are unknown. The growth of popular rights in the latter half of the fourth century gave a great impetus to the activity of the assemblies in general, as is manifested in the Genucian, Publilian, and Hortensian legislation. In 312 when the change was made in the appraisements from land to money, many aerarii who had voted with the proletarians must have been advanced to the higher classes.[1260] This step toward the democratization of the comitia centuriata, following upon the reduction of the patrum auctoritas to a mere formality, could not help adding new energy to the institution, leading to further changes in a popular direction. The class ratings which are known to history were established no earlier than 269.[1261] Two other more important changes, which can be but approximately dated, must now be considered in detail. They are (1) the abolition of the equestrian prerogative and the introduction of the custom of drawing by lot a prerogative century from the first class on each occasion before the voting began; (2) the division of the citizens into classes and centuries within the several tribes. These two innovations are commonly grouped together under the name of the “reform.” As they have no necessary connection with one another, they need not have been simultaneous. Livy’s narrative of the happenings of 396[1262] and of 383[1263] seems to imply that they had been introduced before these dates.[1264] But the passages here referred to are uncertain; and at all events they belong to a period in which the centuries may still have been closely connected with the tribes.[1265] But should they be so interpreted as to apply to the reformed centuriate assembly, they might still be looked upon as historical anticipations for the reason that Livy’s[1266] account of the year 296 has reference to a feature of the old organization. This disposition of the three passages is supported by the following consideration. Had the reform been introduced much earlier than 269, the annalists would have assigned it to Servius Tullius, just as they assigned to him thirty tribes (reached in 318), all thirty-five tribes (reached in 241), and the census ratings in the sextantarian asses (established in or after 269);[1267] and in that case all memory of the original Servian system would have been lost. The circumstance that we are acquainted with it in some detail is proof of its survival into the third century B.C. In fact Livy’s[1268] chief reference to the reform indicates that it was completed, if not undertaken, after the number of tribes had been brought up to thirty-five (241). On the other hand it came before the opening of his third decade (218), which takes the new