Some time after this, a savant who had left Egypt in the reign of Theilon, and had now returned after a long absence, chanced to hear of the mysterious book, and said that he knew what it was, and could explain its history. The caliph immediately admitted him to an audience, and the old man addressed him as follows:
"O sovereign ruler, may the Almighty prolong your days! Only one man can read this book, its rightful master, the sheik Hassan Abdallah, son of El-Achaar. This man had travelled through many lands, and penetrated into the mysterious city of Aram, built on columns, from which he brought this book, which no one but himself could read. He made use of it in his experiments in alchemy, and by its aid he could transmute the most worthless metals into gold. The caliph Theilon, your father, having learned this, commanded the sage to be brought before him, with a view of compelling him to reveal the secret of his knowledge. Hassan Abdallah refused to do so, for fear of putting into the hands of the unjust an instrument of such terrible power; and the prince, in a rage, laid hold of the chest, and ordered the sage to be thrown into prison, where he still remains, unless he has died since that time, which is forty years ago."
On hearing this, Mohammed immediately despatched his officers to visit the prisons, and, on their return, learned with pleasure that Hassan was still alive. The caliph ordered him to be brought forth and arrayed in a dress of honour; and, on his appearing in the audience chamber, the prince made him sit down beside him, and begged him to forgive the unjust treatment which his father had caused him to undergo. He then told him how he had accidentally discovered that he was still alive; and at last, placing the mysterious book before him, said,
"Old man, if this book could make me the owner of all the treasures of the world, I would not consent to possess it, since it only belongs to me by injustice and violence."
On hearing these words, Hassan burst into tears.
"O God," he exclaimed, "all wisdom proceeds from Thee! Thou causest to arise from the same soil the poisonous and the wholesome plant. Every where good is placed by the side of evil. This prince, the support of the feeble, the defender of the oppressed, who has conferred on me the happiness of spending my remaining years in the light of day, is the son of the tyrant who plunged Egypt in mourning, and who kept me for forty years in a loathsome dungeon. Prince," added the old man, addressing Mohammed, "what I refused to the wrath of your father, I willingly grant to your virtues: this book contains the precepts of the true science, and I bless Heaven that I have lived long enough to teach it to you. I have often risked my life to become the master of this wonderful book, which was the only article of value that I brought from Aram, that city into which no man can enter who is not assisted by Heaven."
The caliph embraced the old man, and, calling him his father, begged him to relate what he had seen in the city of Aram.
"Prince," replied Hassan, "it is a long story, as long, nearly, as my whole life."
He then proceeded as follows.
