CALIPH AL-MAAMUN AND THE STRANGE SCHOLAR.
It is said of Al-Maamun that, among the Caliphs of the house of Abbas, there was none more accomplished in all branches of knowledge than he. Now on two days in each week, he was wont to preside at conferences of the learned, when the lawyers and theologians disputed in his presence, each sitting in his several-rank and room. One day as he sat thus, there came into the assembly a stranger, clad in ragged white clothes, who took seat in an obscure place behind the doctors of the law. Then the assembly began to speak and debate difficult questions, it being the custom that the various propositions should be submitted to each in turn, and that whoso bethought him of some subtle addition or rare conceit, should make mention of it. So the question went
