The few in any way acquainted with Greek literature were indebted to the Latin translations of the Arabs; while the Jewish rabbinical learning, whose more useful lore was encumbered with much mystical nonsense, enjoyed considerable reputation at this period. The most distinguished of the rabbis taught in the schools in London, York, Lincoln, Oxford, and Cambridge; and Christendom has to confess its obligations for its first acquaintance with science to the enemies of the Cross.[53] The later Jewish authorities had largely developed the demonology of the subjects of Persia; and the spiritual or demoniacal creations of the rabbinical works of the Middle Ages might be readily acceptable, if not coincident, to Christian faith. But the Western Europeans, before the philosophy of the Spanish Arabs was known, had come in contact with the Saracens and Turks of the East during frequent pilgrimages to the tomb of Christ; and the fanatical crusades of the eleventh and twelfth centuries facilitated and secured the hazardous journey. Mohammedans of the present day preserve the implicit faith of their ancestors in the efficacy of the 113th chapter of the Koran against evil spirits, the spells of witches and sorcerers--a chapter said to have been revealed to the Prophet of Islam on the occasion of his having been bewitched by the daughters of a Jew. The Genii or Ginn--a Preadamite race occupying an intermediate position between angels and men, who assume at pleasure the form of men, of the lower animals, or any monstrous shape, and propagate their species like, and sometimes with, human kind--appear in imposing proportions in 'The Thousand and One Nights'--that rich display of the fancy of the Oriental imagination.[54] Credulous and confused in critical perception, the crusading adventurers for religion or rapine could scarcely fail to confound with their own the peculiar tenets of an ill-understood mode of thought; and that the critical and discriminating faculties of the champions of the Cross were not of the highest order, is illustrated by their difficulty in distinguishing the eminently unitarian religion of Mohammed from paganism. By a strange perversion the Anglo-Norman and French chroniclers term the Moslems _Pagans_, while the Saxon heathen are dignified by the title of _Saracens_; and the names of Mahmoud, Termagaunt, Apollo, could be confounded without any sense of impropriety. However, or in whatever degree, Saracenic or rabbinical superstition tended to influence Christian demonology, from about the end of the thirteenth century a considerable development in the mythology of witchcraft is perceptible.[55] [53] Chymistry and Algebra still attest our obligation by their Arabic etymology.