The medieval period of Judeo-German literature was by no means confined to the Slavic countries. It reacted on the Jews who had remained in Germany, who, in their narrow Ghetto life, were excluded from an active participation in the German literature of their country. This reaction was not due alone to the fact that the specifically Jewish literature appealed in an equal degree to those who had been left behind in their old homes, but in a larger measure to the superior intellectual activity of the emigrants and their descendants who kept alive the spark of Jewish learning when it had become weakened at home and found no food for its replenishment within its own communities. They had to turn to the Slavic lands for their teachers and Rabbis, who brought with them not only their Hebrew learning, but also their Judeo-German language and literature. Up to the middle of the eighteenth century there was no division of the Jews of the west and the east of Europe; they took equal part in the common Judeo-German literature, however scanty its scope. What was produced in Russia was read with the same pleasure in Germany, and _vice versa_, even though the spoken form of the vernacular in Slavic countries was more and more departing from that of Germany. Even Mendelssohn's teacher was a Galician Jew. But with Mendelssohn a new era had dawned in the history of the German Jews. By his example the dialect was at once abandoned for the literary language, and the Jews were once more brought back into the fold of the German nation. The separation of the two branches of the German Jews was complete, and the inhabitants of the Slavic countries were left to shift for themselves. For nearly one hundred years they had to miss the beneficent effects of an intellectual intercourse with the West, and in the beginning of our century the contrast between the two could not have been greater: the German Jews were rapidly becoming identified with the spiritual pursuits of their Gentile fellow-citizens, the Slavic Jews persevered in the medievalism into which they had been thrown centuries before. Only by slow degrees did the Mendelssohnian Reform find its way into Poland and Russia; and even when its influence was at its highest, it was not possible for it to affect those lands in the same way that it affected the districts that were more or less under German influence. The German language could not become the medium of instruction for the masses, whose homely dialects had so far departed from their mother-tongue as to make the latter unintelligible to them. In Russia it was a long time before the native literature could make itself felt, or before Russian education came to take the place of the German culture; so in the meanwhile the Judeo-German language was left to its own evolution, and a new literature had its rise.