The familiar acquaintance with Aristotle and the Arabians became first evident in Alexander of Hales (died 1245), the _Doctor irrefragabilis_. The earlier stages by which this familiarity came about has been shown above (p. 35). Hitherto the acquaintance with Aristotle was very slight, and through many centuries it was limited, as we saw above (p. 37), more especially to his Logic, which had survived from the earliest times and was transmitted in the works of Boethius, Augustine and Cassiodorus. It was only when we came to Scotus Erigena that we found (p. 59) a knowledge of Greek, although it was quite unusual in his day. In Spain, under the Arabians, the sciences flourished greatly. In particular the university of Cordova in Andalusia was a centre-point of learning; many from the lands of the West journeyed thither, just as even the Pope Sylvester II., so well known in his earlier days as Gerbert, escaped as a monk to Spain for the purpose of studying with the Arabs.[32] The sciences of medicine and alchemy were diligently pursued. Christian doctors there studied medicine under the Jewish-Arabian teachers. It was principally the Aristotelian metaphysics and physics which were then known, and from these abstracts (_summæ_) were constructed. The logic and metaphysics of Aristotle were spun out with extreme fineness into endless distinctions, and brought into genuine syllogistic forms of the understanding, which constituted for the most part the principle for the treatment of the subject dealt with. In this way dialectic subtlety was much increased, while the properly speculative side in Aristotle remained for the spirit of externality, and consequently also of irrationality, in the background.