The Caliph Haroun-al-Raschid sat in his palace, wondering if there was anything left in the world that could possibly give him a few hours' amusement, when Giafar the grand-vizir, his old and tried friend, suddenly appeared before him. Bowing low, he waited, as was his duty, till his master spoke, but Haroun-al-Raschid merely turned his head and looked at him, and sank back into his former weary posture.  
Now Giafar had something of importance to say to the Caliph, and had no intention of being put off by mere silence, so with another low bow in front of the throne, he began to speak.
 
"Commander of the Faithful," said he, "I have taken on myself to remind your Highness that you have undertaken secretly to observe for yourself the manner in which justice is done and order is kept throughout the city. This is the day you have set apart to devote to this object, and perhaps in fulfilling this duty you may find some distraction from the melancholy to which, as I see to my sorrow, you are a prey."
 
"You are right," returned the Caliph, "I had forgotten all about it. Go and change your coat, and I will change mine."
 
A few moments later they both re-entered the hall, disguised as foreign merchants, and passed through a secret door, out into the open country. Here they turned towards the Euphrates, and crossing the river in a small boat, walked through that part of the town which lay along the further bank, without seeing anything to call for their interference. Much pleased with the peace and good order of the city, the Caliph and his vizir made their way to a bridge, which led straight back to the palace, and had already crossed it, when they were stopped by an old and blind man, who begged for alms.
 
The Caliph gave him a piece of money, and was passing on, but the blind man seized his hand, and held him fast.
 
"Charitable person," he said, "whoever you may be grant me yet another prayer. Strike me, I beg of you, one blow. I have deserved it richly, and even a more severe penalty."
 
The Caliph, much surprised at this request, replied gently: "My good man, that which you ask is impossible. Of what use would my alms be if I treated you so ill?" And as he spoke he tried to loosen the grasp of the blind beggar.
 
"My lord," answered the man, "pardon my boldness and my persistence. Take back your money, or give me the blow which I crave. I have sworn a solemn oath that I will receive nothing without receiving chastisement, and if you knew all, you would feel that the punishment is not a tenth part of what I deserve."
 
Moved by these words, and perhaps still more by the fact that he ha............