hints at the existence of a third such epoch beginning with R. Judah the Patriarch, the compiler of the Mishnah (220 A.C.),(33) and ending with the expulsion of the Jews from Spain (1492). This idea is not further developed by Krochmal; but it would be interesting to ask, by the way, in which phase of the three‐fold process—rise, maturity, or decay—are we at the present time? The next five chapters may be regarded as an excursus on the preceding two. Krochmal discusses the Biblical books which belong to the period of the Exile and of the Second Temple, such as the Second Isaiah, certain Exilic and Maccabean psalms, Ecclesiastes, certain Apocryphal books, and the work of the Men of the Great Synagogue. They contain, again, researches on the various sects, such as the Assideans, Sadducees, Pharisees, Essenes, the Gnostics, the Cabbalists and their relation to the latter, and the Minim,(34) who are mentioned in the Talmud. In another part of this excursus Krochmal describes the systems of the Alexandrian Jewish philosophers, such as Philo and Aristobulus, and discusses their relation to certain theosophic ideas in various Midrash‐collections. The author also attempts to prove the necessity of Tradition; he shows its first traces in the Bible, and explains the term Sopherim (scribes); and he points out the meaning of the phrase “A law unto Moses from Mount Sinai,”(35) and similar expressions. He gives a summary of the development of the Halachah in its different stages, the criteria by which the older Halachahs may be discriminated; he seeks to arrive at the origin of the Mishnah, and deals with various cognate topics. In another discourse Krochmal endeavours to explain the term Agadah,(36) its origin and development; the different kinds of Agadah and their relative value. Chapter XVI. contains the Prolegomena to a philosophy of the Jewish religion in accordance with the principles laid down by Hegel. In the seventeenth and last chapter the author gives a general introduction to the Philosophy of Ibn Ezra, and quotes illustrative extracts. The space of an essay does not permit me to give further details of Krochmal’s book. I am conscious that the preceding outline is deficient in quality as well as in quantity. Yet, even from this meagre abstract, the reader will gather that Krochmal reviews many of the great problems which concern religion in general and Judaism in particular. Zunz somewhere remarks that Krochmal was inspired in his work by the study of Hegel, just as Maimonides had been by the study of Aristotle. I give this statement solely on the authority of Zunz, as I myself have never made a study of the works of the German philosopher, and am therefore unable to express an opinion on the question.