The Exilarch derived his income partly from certain districts and towns, and partly from irregular receipts. The districts Naharowan (east of the Tigris), Farsistan, Holwan--as far as the jurisdiction of the Exilarch extended--even during the period of decadence, brought him an income of 700 golden denarii ($1700). We can easily imagine how great his revenue must have been in palmy days. The Exilarch also had the right of imposing a compulsory tax upon the communities under his jurisdiction, and the officials of the Caliph supported him in this because they themselves had an interest in it. The president of the college of Sora was the second in rank in the Judæo-Babylonian community. He was the only one who held the title of Gaon officially, and he had the precedence over his colleague of Pumbeditha on all occasions, even though the former were a young man and the latter an aged one. Meanwhile, the school of Pumbeditha enjoyed perfect equality and independence with respect to its internal affairs, except when one or another Exilarch, according to Oriental custom, made illegal encroachments upon it. Next to the president came the chief judge, who discharged the judicial duties, and was, as a rule, his successor in office. Below these were seven presidents of the Assembly of Teachers, and three others who bore the title of Associate or scholar, and who together seem to have composed the Senate in a restricted sense. Then came a college of a hundred members, which was divided into two unequal bodies, one of seventy members representing the "great Synhedrion," the other of thirty forming the "smaller Synhedrion." The seventy were ordained, and consequently qualified for promotion; they bore the title of Teacher. The thirty or "smaller Synhedrion" do not seem to have been entitled to a seat and vote, they were simply candidates for the higher dignity. The members of the college generally bequeathed their offices to their sons, but the office of president was not hereditary.