Now there is no doubt that Krochmal’s book is not without defects. The materials are not always well arranged, there is at times a want of proportion in the length at which the various points are treated, and the author occasionally seems to wander from the subject in hand. But we shall be better able to account for these and similar technical faults, as well as to appreciate the real value of the author’s work, if we consider the following fact. Nachman Krochmal’s object was to elaborate a philosophy of Jewish history, to trace the leading ideas that ran through it, and the ultimate causes that led to its various phases. But, unfortunately, at the time when Krochmal began to write, there did not exist a Jewish history at all. The labours of Zunz were conducted in an altogether different field. Not to mention the names of the younger scholars then unborn, Graetz, the author of the _History of the Jews_, and Weiss, who wrote a history of the Tradition, were still studying at college. Frankel’s masterly essays on the Essenes and the Septuagint, his well‐known work, _Introduction to the __ Mishnah_, and the results of Geiger’s most interesting and suggestive researches on the older and later Halachah, and on the Pharisees and Sadducees, had yet to be written. Rapoport’s great treatise, _Erech Millin_,(37) had not been published at that time, and Steinschneider was not yet working at his historical sketch of Jewish literature. It was not till six years after Krochmal’s death (viz. in 1846) that Landauer’s memorable studies on the Jewish mystics were given to the world. Even the bad books of Julius Fürst, such as his _History of the Canon_, and his still worse _History of Jewish Literature in Babylon_, were then unwritten. Neither the most charlatanic _History of the Opinions and Teachings of All the Jewish Sects_, by Peter Beer, the universal provider, nor Jost’s most honest but narrow‐minded and superficial _History of the Jews_, was of much use to Krochmal. Jost’s more scholarly works were not published till long afterwards. Krochmal was thus without the guidance of those authorities to which we are now accustomed to turn for information. Excepting the aid that he derived from the writings of Azariah de Rossi,(38) Krochmal was therefore compelled to prosecute all the necessary research for himself; he had to establish the facts of Jewish history as well as to philosophise upon them. Hence, in the very midst of his philosophical analysis, the author was bound to introduce digressions on historical subjects, in order to justify as well as to form the basis of that analysis. He had to survey the ground and to collect the materials, besides constructing the plan of the edifice and working at its erection. Nevertheless, it is precisely for these historical excursuses that Krochmal has deserved the gratitude of posterity. He it was who taught Jewish scholars how to submit the ancient Rabbinic records to the test of