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 he gave rules which are scarcely understood even by laborious computers. He resided with a certain philosopher of that sect, whose good will he had obtained, first by great liberality, and then by promises. The Saracen had no objection to sell his knowledge; he frequently associated with him; would talk with him of matters at times serious, at others trivial, and lend him books to transcribe. There was however one volume, containing the knowledge of his whole art, which he could never by any means entice him to lend. In consequence Gerbert was inflamed with anxious desire to obtain this book at any rate, "for we ever press more eagerly towards what is forbidden, and that which is denied is always esteemed most valuable." Trying, therefore, the effect of entreaty, he besought him for the love of God, and by his friendship; offered him many things, and promised him more. When this failed he tried a nocturnal stratagem. He plied him with wine, and, with the help of his daughter, who connived at the attempt through the intimacy which Gerbert's attentions had procured, stole the book from under his pillow and fled. Waking suddenly, the Saracen pursued the fugitive by the direction of the stars, in which art he was well versed. The fugitive too, looking back, and discovering his danger by means of the same art, hid himself under a wooden bridge which was near at hand; clinging to it, and hanging in such a manner as neither to touch earth nor water. In this manner the eagerness of the pursuer being eluded, he returned home. Gerbert, then quickening his pace, arrived at the sea-coast. Here, by his incantations, he called up the devil, and made an agreement with him to be under his dominion for ever, if he would defend him from the Saracen, who was again pursuing, and transport him to the opposite coast: this was accordingly done.

Probably some may regard all this as a fiction, because the vulgar are used to undermine the fame of scholars, saying that the man who excels in any admirable science, holds converse with the devil. Of this, Boethius, in his book. On