Usury, though interest on money was strictly prohibited by the Prophet, is among the Muslims of the present day a common practice. They evade the letter of the law by putting what the Persians call “a legal cap over the head” of the usurious transaction. The money-lender picks up a handful of barley and says to the borrower, “Give me the rate of interest as the cost of this grain, which I now offer to sell to you at that price;” and the borrower replies that he accepts the bargain. Also, a merchant must know all the laws appertaining to buying and selling. Imám ’Ali is said to have made a daily round of the bazaars of Kufa crying out the while, “O ye merchants and traders, deal honestly and in accordance with the laws of your Prophet. Swear not, neither tell lies, and cheat not your customers. Beware of using false weights, and walk ye in the paths of righteousness.” A high priest in Mecca assured me that to enjoy a derham of interest is as bad as taking the blood of seventy virgins. The admonitions of ’Alí the Just, though sometimes read, are less often followed. On leaving his house a merchant must say “Bismillah,” and then blow to his left and his right and also in front of him, so as to clear the way to good business. The pious recite, on entering the bazaar, a prayer ordained for the occasion. When the bargain is clinched the seller should cry out, “God is great! God is great!” But there should be no dishonest bargaining over the purchasing of these four things: the winding sheets for the dead, the commodities to be distributed in charity, the expenses on the journey to Mecca, and the price of a slave’s ransom. In all these transactions the buyer and seller must act according to the dictates of fair play. The man who buys a slave should lay hold of him by a hair of his head and say the prescribed prayer; after which, if guided by Imám Jafar, he must change the name of his purchase. Slaves are treated with every consideration, so much so indeed that in the household of Eastern potentates, whose treatment of their dependents is extremely arbitrary, the slaves lord it over the servants.