Then she overturned the pan and went out as she had come and the wall closed up again. When the Vizier saw this, he said, 'This is a thing that must not be kept from the King. So he went to him and told him what he had witnessed; and the King said, 'I must see this with my own eyes.' Then he sent for the fisherman and commanded him to bring him other four fish like the first; and the fisherman went down at once to the lake and casting his net, caught other four fish and returned with them to the King, who ordered him other four hundred diners and set a guard upon him till he should see what happened. Then he turned to the Vizier and said to him, 'Come thou and fry the fish before me.' Quoth the Vizier, 'I hear and obey.' So he fetched the frying-pan and setting it on the fire, cleaned the fish and threw them in: but hardly had he turned them, when the wall opened, and out came a black slave, as he were a mountain or one of the survivors of the tribe of Aad,[FN#21] with a branch of a green tree in his hand: and he said, in a terrible voice, 'O fish, O fish, are you constant to the old covenant?' Whereupon they lifted up their heads and cried out' 'Yes, yes; we are constant: Return, and we return: keep faith, and so will we: Or, if thou wilt, forsake, and we'll do like to thee!' Then the slave went up to the pan and overturning it with the branch, went out as he had come, and the wall closed up as before. The King looked at the fish and found them black as coal; whereat he was bewildered and said to the Vizier, 'This is a thing about which it is impossible to keep silence; and indeed there must be some strange circumstance connected with these fish.' Then he sent for the fisherman and said to him, 'Hark ye, sirrah, whence hadst thou those fish?' 'From a lake between four hills,' answered he, 'on the thither side of the mountain behind the city.' 'How many days' journey hence?' asked the King; and the fisherman said, 'O my lord Sultan, half an hour's journey.' At this the King was astonished and ordering the troops to mount, set out at once, followed by his suite and preceded by the fisherman, who began to curse the Afrit. They rode on over the mountain and descended into a wide plain, that they had never before set eyes on, whereat they were all amazed. Then they fared on till they came to the lake lying between the four hills and saw the fish therein of four colours, red and white and yellow and blue. The King stood and wondered and said to his attendants, 'Has any one of you ever seen this lake before?' But they answered, 'Never did we set eyes on it in all our lives, O King of the age.' Then he questioned those stricken in years, and they made him the same answer. Quoth he, 'By Allah, I will not return to my capital nor sit down on my chair of estate till I know the secret of this pond and its fish!' Then he ordered his people to encamp at the foot of the hills and called his Vizier, who was a