Few fragments now survive the general decay, to record the high estate of the once populous metropolis, or reveal the magnificence it could formerly boast in works of public utility. The chief buildings are believed to have been situated ten miles inland, and to have been swallowed up by the ever rising, never ebbing, tide of the desert. The red brick conduit of Abd el Wahab can still be traced from the Durab el Horaibi, whence it stretches to Bir Omheit, upwards of eight miles, across a now dilapidated bridge. Here are numerous wells, which supplied the reservoirs; but, "like the baseless fabric of a vision," every vestige of an edifice has vanished. Among the most perfect and conspicuous relics of the past are the laborious and costly means adopted to insure in so arid and burning a climate, a plentiful supply of water. In addition to the wells, three hundred in number, the remains of basins of great magnitude are found in various directions; and in the Valley of Tanks are a succession of hanging cisterns, formed by excavations in the limestone rock. These are lined with flights of steps, and supported by lofty buttresses of imperishable masonry, forming deep reservoirs of semi-elliptical form, which still blockade every channel in the mountain side, and once served to collect the precious drops from heaven, when showers doubtless fell more abundantly than at the present day. In the extensive repositories for the dead, too, may be found assurances of the former population of Aden. Many of the countless tombs in the Turkish cemetery were of white marble, and bore on jasper tablets elaborately-sculptured inscriptions surmounted by the cap and turban; but the greater number of these pillared monuments have either disappeared or been overthrown. Of the evidences of Mohammadanism that once graced the city, nearly all lie buried from sight beneath heaps of accumulated rubbish and debris, the removal of portions of which has disclosed many curious coins of remote date. The minaret of Menaleh, and a tottering octagon of red brick, attached to the Jama el Musjid, lone survivors of the wreck, still point to the sky; and of the few mosques that have been spared by the destroying hand of time, the principal is that of the tutelar saint of the city, beneath the cupola of which, invested with a pall of crimson silk, and enshrined in the odour of sanctity, repose the venerated remains of Sheikh Hydroos.