But the right of acting with the Plebs, which was thus guaranteed to the tribune, had another and more positive aspect. It might be used to elicit formal resolutions passed by the whole plebeian _concilium_ in their own interests, and to give this body the character of a guild which, within certain limits, could pass rules binding on all its members. So long as the resolutions of this body were purely self-regarding, did not infringe on the public law, and were voluntarily accepted by all the members, they did not need formal ratification by any higher authority. But sometimes resolutions were passed which the Plebs was incapable of carrying into effect; in this case they were mere petitions to the only recognised legislative power, the consuls presiding over the _comitia centuriata_. We have an instance of this procedure, dated within forty years of the establishment of the tribunate, which shows how far-reaching the demands of this _concilium_ might be. In 456 B.C. the tribune Icilius elicited from this assembly a resolution to the effect that the Aventine, until that time state property,[368] should be assigned to the Plebs. With this petition he approached the consuls and the Senate, and requested them to gain the consent of the _comitia centuriata_ in due form of law.[369] The same procedure must be imagined for any _plebiscita_, which refer to matters affecting the whole community, down to the year 287, when, as we shall see, these resolutions of the Plebs were first raised to a level with the laws. In framing its resolutions the Plebs was as dependent on the tribune as the _comitia_ was on the consuls; the _rogatio_ of the magistrate could only be answered by the “Yes” or “No” of the burgesses. Its elective proceedings were similar to those of the whole people. The tribune, before he quitted office, nominated successors and submitted their names to the Plebs. The differences were that the voting was by _curiae_ and not by _centuries_, that the _patrum auctoritas_ had here no place, and that the formal taking of the auspices was not necessary to the validity of the proceedings, although doubtless the tribunes employed their right of taking private auspices[370] to give a sanctity to the act of the Plebs.