It appears to have been about the close of the tenth century that the more curious and inquisitive spirits of Europe first had recourse to the East as a source of such information and art, as they found most glaringly deficient among their countrymen. We have seen that in Persia there was an uninterrupted succession of professors in the art of magic: and, when the followers of Mahomet by their prowess had gained the superiority over the greater part of Asia, over all that was known of Africa, and a considerable tract of Europe, they gradually became awake to the desire of cultivating the sciences, and in particular of making themselves masters of whatever was most liberal and eminent among the disciples of Zoroaster. To this they added a curiosity respecting Greek learning, especially as it related to medicine and the investigation of the powers of physical nature. Bagdad became an eminent seat of learning; and perhaps, next to Bagdad, Spain under the Saracens, or Moors, was a principal abode for the professors of ingenuity and literature. GERBERT, POPE SILVESTER II. As a consequence of this state of things the more curious men of Europe by degrees adopted the practice of resorting to Spain for the purpose of enlarging their sphere of observation and knowledge. Among others Gerbert is reported to have been the first of the Christian clergy, who strung themselves up to the resolution of mixing with the followers of Mahomet, that they might learn from thence things, the knowledge of which it was impossible for them to obtain at home. This generous adventurer, prompted by an insatiable thirst for information, is said to have secretly withdrawn himself from his monastery of Fleury in Burgundy, and to have spent several years among the Saracens of Cordova. Here he acquired a knowledge of the language and learning of the Arabians, particularly of their astronomy, geometry and arithmetic; and he is understood to have been the first that imparted to the north and west of Europe a knowledge of the Arabic numerals, a science, which at first sight might be despised for its simplicity, but which in its consequences is no inconsiderable instrument in subtilising the powers of human intellect. He likewise introduced the use of clocks. He is also represented to have made an extraordinary proficiency in the art of magic; and among other things is said to have constructed a brazen head, which would answer when it was spoken to, and oracularly resolve many difficult questions. [151] The same historian assures us that Gerbert by the art of necromancy made various discoveries of hidden treasures, and relates in all its circumstances the spectacle of a magic palace he visited underground, with the multiplied splendours of an Arabian tale, but distinguished by this feature, that, though its magnificence was dazzling to the sight, it would not abide the test of feeling, but vanished into air, the moment it was attempted to be touched.