proves that they were gifted with the faculty of applying old precept to modern instance. They regulated the social and religious affairs of all the Jews in the diaspora. They improved educational methods, and were pioneers in the popularization of learning. By a large collection of Case Law, that is, decisions in particular cases, they brought the newer Jewish life into moral harmony with the principles formulated by the earlier Rabbis. The Gaonim were the originators or, at least, the arrangers of parts of the liturgy. They composed new hymns and invocations, fixed the order of service, and established in full vigor a system of Minhag, or Custom, whose power became more and more predominant, not only in religious, but also in social and commercial affairs.
The literary productions of the Gaonic age open with the Shecltoth written by Achai in the year 760. This, the first independent book composed after the close of
