Despite the dogmatic air clinging to the critical introductions to the study of the Old Testament, their authors have not shrunk from treating the book sacred to two religions with childish arbitrariness. Since the days of Spinoza's essay at rationalistic explanation, Bible criticism has been the wrestling-ground of the most extravagant exegesis, of bold hypotheses, and hazardous conjectures. No Latin or Greek classic has been so ruthlessly attacked and dissected; no mediæval poetry so arbitrarily interpreted. As a natural consequence, the æsthetic elements were more and more pushed into the background. Only recently have we begun to ridicule this craze for hypotheses, and returned to more sober methods of inquiry. Bible criticism reached the climax of absurdity, and the scorn was just which greeted one of the most important works of the critical school, Hitzig's "Explanation of the Psalms." A reviewer said: "We may entertain the fond hope that, in a second edition of this clever writer's commentary, he will be in the enviable position to tell us the day and the hour when each psalm was composed." The reaction began a few years ago with the recognition of the inadequacy of Astruc's document hypothesis, until then the creed of all Bible critics. Astruc, a celebrated French physician, in 1753 advanced the theory that the Pentateuch--the five books of Moses--consists of two parallel documents, called respectively Yahvistic and Elohistic, from the name applied to God in each. On this basis, German science after him raised a superstructure. No date was deemed too late to be assigned to the composition of the Pentateuch. If the historian Flavius Josephus had not existed, and if Jesus had not spoken of "the Law" and "the prophets," and of the things "which were written in the Law of Moses, and in the Prophets, and in the Psalms," critics would have been disposed to transfer the redaction of the Bible to some period of the Christian era. So wide is the divergence of opinions on the subject that two learned critics, Ewald and Hitzig, differ in the date assigned to a certain biblical passage by no less than a thousand years!