Evidently the _Mutakallamin_ movement, professedly an orthodox reaction from the Mu`tazilites, represents a great widening of philosophical influences. Philosophy was no longer a subject confined to one group of scholars who were interested in Greek writings, but had spread out until it reached the mosques, and could no longer be thrust aside as an heretical aberration, and in its outspread it had penetrated the Jewish schools as well. But Sa`id produced no immediate disciples, and those who followed him in the Jewish academies of Mesopotamia showed no interest in his methods. Yet his work, apparently barren, was destined to have results of the widest importance after a century’s interval. In spite of distance and the difficulties of travel there was a very close and frequent intercourse maintained between all the Jews of the Sefardi group, those, namely, who had adopted Arabic as their ordinary speech and who were living under Muslim rule. The Ashkenazi Jews in the north and centre of Europe who lived in Christian lands and did not use Arabic were definitely separated from these others by the barrier of language, and thus in different surroundings the two groups developed marked differences in their use of Hebrew, in their liturgical formularies, and in their popular beliefs and folk-lore. Thus we must bear in mind that a synagogue in Spain would naturally be in close touch with synagogues in Mesopotamia, but it was not likely to have any contact with one in the Rhine valley. Although the earlier Jewish settlers in Spain and Provence had enjoyed considerable freedom, restrictions had been imposed by the council of Elvira (A.D. 303-4), and they had to suffer considerable severity under the later West Goths. The coming of the Muslims had greatly eased their position, chiefly because the Jews had taken a leading part in assisting and probably in inviting the invaders; they often furnished garrisons to occupy towns which the Muslims had conquered, and were the means of supplying them with information as to the enemy’s movements. It seems probable that they had been in correspondence with the Muslims beforehand, so that they shared with Witiza’s partisans the responsibility of inviting the invasion. Under Umayyad rule their prosperity continued and increased. Very often we find Jews occupying high positions at court and in the civil service, and these favorable conditions seem to have prevailed until the time of the Muwahhids, for it does not appear that the Murabits, for all their fanaticism, took any measures against Christians or Jews.