This city (which is divided into old and new, called Fas Jedide, and Fas El Bâlee) is the most celebrated in West Barbary; it was founded about the 185th year of the Hejira (A.C. 786) by Idris,[67] a descendant of Mohammed. It stands for the most part upon gentle hills, except the centre, which is low, and in winter very wet and dirty. It is not so extensive as Marocco, but the houses being more lofty and spacious, it contains more inhabitants. The houses have flat roofs ingeniously worked in wood, and covered with terrace, on which the inhabitants spread carpets in summer, to recline upon, and enjoy the cool breezes of the evening; a small turret, containing a room or two, is also erected upon them for the use of the females of the family, who resort thither for amusement and pastime. In the centre of each house is an open quadrangle surrounded by a gallery, which communicates with the staircase, and into which the doors of the different apartments open; these doors are both wide and lofty, and are made of curiously carved wood painted in various colours. The beams of the roofs of the different apartments are whimsically painted with gay colours in the arabesque style. The portals of the houses are supported with pillars of brick plaistered over. The principal houses have (Mitferes) cisterns under them, containing water used in the baths, which are built of marble or stone. Every house is also supplied with water from a river which rises in the Atlas, and enters the town in various places by covered channels. The hospitals, colleges, and houses of the great and wealthy have, withinside, spacious courts, adorned with sumptuous galleries, fountains, basons of fine marble, and fish-ponds, shaded with orange, lemon, pomgranate, and fig trees, abounding with fruit, and ornamented with roses, hyacinths, jasmine, violets, and orange flowers, emitting a delectable fragrance. In the city are a great number of mosques, sanctuaries, and other public buildings; about fifty of these are very sumptuous edifices, being ornamented with a kind of marble, unknown in Europe, procured in the Atlas mountains.[68] The maintenance of professors and students in the mosques, has lately become very scanty, the wars having destroyed many of the possessions by which learning was promoted. The students are mostly employed in reading the Koran; if any one read a text which he does not understand, the professor explains it to him in public; at other times they dispute among themselves, and the professor finally explains the passage.