[51] Strutt derives the 'long-continued custom of swimming people suspected of witchcraft' from the Anglo-Saxon mode of judicial trial--the ordeal by water. Another 'method of proving a witch,' by weighing against the Church Bible (a formidable balance), is traced to some of their ancient customs. James VI. (_Demonologie_) is convinced that 'God hath appointed, for a supernatural sign of the monstrous impiety of witches, that the water shall refuse to receive them in her bosom that have shaken off them the sacred water of baptism and wilfully refused the benefit thereof.' From Scandinavia the Normans must have brought a conviction of the truths of magic; and although they had been long settled, before the conquest of England, in Northern France and in Christianity, the traditional glories of the land from which were derived their name and renown could not be easily forgotten. Not long after the Conquest the Arabic learning of Spain made its way into this country, and it is possible that Christian magic, as well as science, may have been influenced by it. Magic, scientifically treated, flourished in Arabic Spain, being extensively cultivated, in connection with more real or practical learning, by the polite and scientific Arabs. The schools of Salamanca, Toledo, and other Saracenic cities were famous throughout Europe for eminence in medicine, chymistry, astronomy, and mathematics. Thither resorted the learned of the North to perfect themselves in the then cultivated branches of knowledge. The vast amount of scientific literature of the Moslems of Spain, evidenced in their public libraries, relieves Southern Europe, in part at least, from the stigma of a universal barbaric illiteracy.[52] Several volumes of Arabian philosophy are said to have been introduced to Northern Europe in the twelfth century; and it was in the school of Toledo that Gerbert--a conspicuous name in the annals of magic--acquired his preternatural knowledge. [52] The royal library of the Fatimites consisted of 100,000 manuscripts, elegantly transcribed and splendidly bound, which were lent, without avarice or jealousy, to the students of Cairo. Yet this collection must appear moderate if we believe that the Ommiades of Spain had formed a library of 600,000 volumes, 44 of which were employed in the mere catalogue. Their capital, Cordova, with the adjacent towns of Malaga, Almeira, and Murcia, had given birth to more than 300 writers; and above 70 public libraries were opened in the cities of the Andalusian kingdom.--_Decline and Fall of the Roman Empire_, lii.