The deme now became the primitive constituent element of the commonwealth, both as to persons and as to property. It had its own demarch, its register of enrolled citizens, its collective property, its public meetings and religious ceremonies, its taxes levied and administered by itself. The register of qualified citizens was kept by the demarch, and the inscription of new citizens took place at the assembly of the demots, whose legitimate sons were enrolled on attaining the age of eighteen, and their adopted sons at any time when presented and sworn to by the adopting citizen. The citizenship could only be granted by a public vote of the people, but wealthy non-freemen were enabled sometimes to evade this law and purchase admission upon the register of some poor deme, probably by means of a fictitious adoption. At the meetings of the demots, the register was called over, and it sometimes happened that some names were expunged—in which case the party thus disfranchised had an appeal to the popular judicature. So great was the local administrative power, however, of these demes, that they are described as the substitute, under the Clisthenean system, for the naucraries under the Solonian and anti-Solonian. The trittyes and naucraries, though nominally preserved, and the latter (as some affirm) augmented in number from forty-eight to fifty, appear henceforward as of little public importance.
Clisthenes preserved, but at the same time modified and expanded, all the main features of Solon’s political constitution; the public assembly, or ecclesia,—the preconsidering senate, composed of members from all the tribes,—and the habit of annual election, as well as annual responsibility of magistrates, by and to the ecclesia. The full value must now have been felt of possessing such pre-existing institutions to build upon, at a moment of perplexity and dissension. But the Clisthenean ecclesia acquired new strength, and almost a new character, from the great increase of the number of citizens qualified to attend it; while the annually changed senate, instead of being composed of four hundred members taken in equal proportion from each of the old four tribes, was enlarged to five hundred, taken equally from each of the new ten tribes. It now comes before us, under the name of Senate of Five Hundred, as an active and indispensable body throughout the whole Athenian democracy: and the practice now seems to have begun (though the period of commencement cannot be decisively proved), of determining the names of the senators by lot. Both the senate thus constituted, and the public assembly, were far more popular and vigorous than they had been under the original arrangement of Solon.