The capital city stands in the end of a fine valley, formed by a mountain in the middle of the island, which is the highest in the world. [45] It is seen three days sail off at sea. There are rubies and several sorts of minerals in it, and all the rocks are for the most part emery, a metalline stone made use of to cut and smooth other precious stones. There grow all sorts of rare plants and trees, especially cedars and cocoa-trees. There is also a pearl fishery in the mouth of its river, and in some of its valleys there are found diamonds. I made, by way of devotion, a pilgrimage to the place where Adam was confined after his banishment from paradise, and had the curiosity to go to the top of it. When I came back to the city, I prayed the king to allow me to return to my country, which he granted me in the most obliging and most honourable manner. He would needs force a rich present upon me; and when I went to take my leave of him, he gave me one much more considerable, and at the same time charged me with a letter for the commander of the faithful, our sovereign, saying to me, I pray you give this present from me, and this letter, to Caliph Haroun Alraschid, and assure him of my friendship. I took the present and letter in a very respectful manner, and promised his majesty punctually to execute the commission with which he was pleased to honour me. Before I embarked, this prince sent for the captain and the merchants who were to go with me, and ordered them to treat me with all possible respect. The letter from the king of Serendib was written on the skin of a certain animal, of great value, because of its being so scarce, and of a yellowish colour. [46] The characters of the letters were of azure, and the contents as follows: ‘The king of the Indies, before whom march a hundred elephants, who lives in a palace that shines with a hundred thousand rubies, and who has in his treasury twenty thousand crowns, enriched with diamonds, to Caliph Haroun Alraschid: ‘Though the present we send you be inconsiderable, receive it however as a brother and a friend, in consideration of the hearty friendship which we bear for you, and of which we are willing to give you proof. We desire the same part in your friendship, considering that we believe it to be our merit being of the same dignity with yourself. We conjure you this in quality of a brother. Adieu.’ The present consisted, first, of one single ruby [47] made into a cup, about half a foot high, an inch thick, and filled with round pearls of half a dram each. Second, the skin of a serpent, whose scales were as large as an ordinary piece of gold, and had the virtue to preserve from sickness those who lay upon it. [48] Third, fifty thousand drams of the best wood of aloes, with thirty grains of camphire as big as pistachios. And fourth, a she slave of ravishing beauty, whose apparel was all covered over with jewels.