Such were the results of their preference of the inductive method of Aristotle, their declining the reveries of Plato.
THEIR GREAT LIBRARIES.

For the establishment and extension of the public libraries, books were sedulously collected.

Thus the khalif Al-Mamun is reported to have brought into Bagdad hundreds of camel-loads of manuscripts.

In a treaty he made with the Greek emperor, Michael III., he stipulated that one of the Constantinople libraries should be given up to him.

Among the treasures he thus acquired was the treatise of Ptolemy on the mathematical construction of the heavens.