historian[324] states that they were respectively enrolled in tribes, as in the former instances. He does not inform us, however, that for this purpose other new tribes were instituted. At all events there seems to be no essential disagreement among our sources; and we have no reasonable ground for doubting an increase, though we may remain uncertain as to the number added.[325] The arrangement was only temporary. In 88 Sulpicius, tribune of the plebs, carried a law containing a provision for the distribution of the new citizens and the libertini among all the thirty-five tribes.[326] His plebiscite was annulled by the senate on the ground that it had been passed by violence;[327] but the provisions contained in it were afterward legalized by a senatus consultum, and it was finally carried into effect by Cinna as consul in 84.[328] This settlement of the question was approved by Sulla[329] for all the Italians excepting the Marsians and the Paelignians, who were enrolled in one tribe—the Sergia.[330] The nature of the tribes may be inferred from their object. The intention of the organizer was to introduce the Greek military system, comprising heavy and light infantry, in which the kind of service to be performed depended upon financial ability to provide equipments.[331] Seeing that a classification of citizens with respect to property was necessary for this purpose, Servius instituted the tribes as a basis for the census. That they contained the ager privatus only is indicated by the exclusion from them of the Capitoline and Aventine hills.[332] Their local character is established by the concurrent testimony of ancient writers.[333] Yet even in the beginning they could but roughly be described as districts, for they excluded all public land and all waters and waste places claimed neither by individuals nor by the government. They retained the approximate character of districts so long only as the territory of annexed communities continued to be formed into new tribes. The process came to an end in 241; and it was as early at least as this date that the Roman colonies, not originally in the tribes, were incorporated in them.[334] Thereafter the annexation of new territory tended more and more to render the tribes geographically indeterminate.[335] The process was far advanced by the admission (90-84) of the Latins and Italians with their lands to the existing tribes,[336] which were further enlarged in the imperial period by the incorporation of provincial communities.[337] As consisting of lands, though no longer necessarily adjacent, they were still considered local.[338]