It was constituted anew each year and was made an exact miniature of the ecclesia which it was to serve. Every ward and township of Attica, to the number of one hundred and over, first eliminated such of its members as had not yet reached their thirtieth year or had already served two terms in the council, and then selected by lot from among the rest the councilor or councilors to which it was entitled on the basis of population. Accordingly, each successive council had from two hundred and fifty to five hundred new and inexperienced members. Not desire or fitness but pure chance determined its personnel. Every section, interest, and class of Attica--if we exclude young men between eighteen and thirty--was adequately represented in it. There was, therefore, a general presumption that it would take the same view of public questions as the ecclesia; that it would do a disservice to its own members should it foster their temporary rights as councilors at the expense of their lifelong rights as members of the ecclesia; that it would, in other words, labor to the best of its ability to present to the ecclesia a well-considered and sufficiently inclusive programme of business. Otherwise, the heliæa had to be faced at the end of the twelve months. A committee of five hundred impresses us as little less unwieldy than an assembly of five thousand. Clisthenes was of the same opinion. Hence he divided his council into ten sections, or prytanies, of fifty members each, and arranged that each prytany should act for the whole for thirty-six days in an order determined by lot at the latest possible moment. The prytany was constituted in such a way that it was a miniature of the council, just as the council was a miniature of the ecclesia. The lot, again applied at the latest possible moment, determined, furthermore, which of its fifty members should be its chairman, and be present with one third of his colleagues in the council chamber for the single twenty-four hours for which he served. The same man was chairman of the council at its daily session, and he also presided at the ecclesia, should a meeting of the citizens be held on his day of office. A chance nomination for a single day's service, at a time not previously known, was, Clisthenes thought, a sufficient safeguard of council and ecclesia against successful scheming, conspiracy, collusion, or other interference with the popular will on the part of the chairman. He was mistaken; and the later democracy took the further precaution of requiring the chairman to relinquish the presidency at the meetings of the council and ecclesia to a board of nine men chosen by lot for that specific purpose from the non-officiating prytanies of the council. One of the nine, designated likewise by lot, was given the special honor and responsibility of putting the motions and declaring the votes.