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Demetrius Phalereus, who was library keeper to the king, was now endeavoring, if it were possible, to gather together all the books that were in the habitable earth, and buying whatsoever was anywhere valuable.… And when once Ptolemy asked him, How many ten thousands of books he had collected? He replied, that he had already about twenty times ten thousand, but that, in a little time, he should have fifty times ten thousand.