Caliph Chasid, of Bagdad, was resting comfortably on his divan one fine afternoon. He was smoking a long pipe, and from time to time he sipped a little coffee which a slave handed to him, and after each sip he stroked his long beard with an air of enjoyment. In short, anyone could see that the Caliph was in an excellent humour. This was, in fact, the best time of day in which to approach him, for just now he was pretty sure to be both affable and in good spirits, and for this reason the Grand Vizier Mansor always chose this hour in which to pay his daily visit.He arrived as usual this afternoon, but, contrary to his usual custom, with an anxious face. The Caliph withdrew his pipe for a moment from his lips and asked, 'Why do you look so anxious, Grand Vizier?'The Grand Vizier crossed his arms on his breast and bent low before his master as he answered: 'Oh, my Lord! whether my countenance be anxious or not I know not, but down below, in the court of the palace, is a pedlar with such beautiful things that I cannot help feeling annoyed at having so little money to spare.'The Caliph, who had wished for some time past to give his Grand Vizier a present, ordered his black slave to bring the pedlar before him at once. The slave soon returned, followed by the pedlar, a short stout man with a swarthy face, and dressed in very ragged clothes. He carried a box containing all manner of wares-strings of pearls, rings, richly mounted pistols, goblets, and combs. The Caliph and his Vizier inspected everything, and the Caliph chose some handsome pistols for himself and Mansor, and a jewelled comb for the Vizier's wife. Just as the pedlar was about to close his box, the Caliph noticed a small drawer, and asked if there was anything else in it for sale. The pedlar opened the drawer and showed them a box containing a black powder, and a scroll written in strange characters, which neither the Caliph nor the Mansor could read.'I got these two articles from a merchant who had picked them up in the street at Mecca, ' said the pedlar. 'I do not know what they may contain, but as they are of no use to me, you are welcome to have them for a trifle.'The Caliph, who liked to have old manuscripts in his library, even though he could not read them, purchased the scroll and the box, and dismissed the pedlar. Then, being anxious to know what might be the contents of the scroll, he asked the Vizier if he did not know of anyone who might be able to decipher i