others to the ground; and every spot along these shores is celebrated." When the northeastern and the western shores of the Arabian peninsula had thus been investigated, there still remained to be explored the south eastern shore, the coast of the anciently renowned province of Hadramaut, extending from Tehama, on the Red Sea, to the province of Oman, at the entrance to the Persian Gulf; and it is to the discoveries made in this almost unknown part of the world that I now wish more particularly to allude. In the year 1839 Capt. Haines, the commander of the expedition and the present governor of Aden, published his survey of about two fifths of this coast, extending from the straits of Bab-el-Mandeb as far east as Missenaat, in long. 51° east of Greenwich.[63] In the year 1845, he published his further survey of about an equal portion extending to Cape Isolette, in long. 57° 51´, leaving about one fifth of the whole extent on the eastern end still to be explored.[64] In June, 1843, Adolphe Baron Wrede, a Hanoverian gentleman, made an excursion from Makallah on the coast, into the interior of the country. He visited among other places an extensive valley called Wadi Doan, which he thus describes. "The sudden appearance of the Wadi Doan, took me by surprise and impressed me much with the grandeur of the scene. The ravine, five hundred feet wide and six hundred feet in depth, is enclosed between perpendicular rocks, the debris of which form in one part a slope reaching to half their height. On this slope, towns and villages rise contiguously in the form of an amphitheatre; while below the date grounds, which are covered with a forest of trees, the river about twenty feet broad and enclosed by high and walled embankments is seen winding through fields laid out in terraces, then pursuing its course in the open plain, irrigated by small canals branching from it. My first view of the valley disclosed to me four towns and four villages, within the space of an hour's distance." He also gives an account of some curious spots of quicksand, in the midst of the great desert of El-Akkaf, which are regarded with superstitious horror by the wandering Bedouins. A cord of sixty fathoms in length with a plummet at the end, which he cast into one of them, disappeared in the course of five minutes. His narrative is published in the fourteenth volume of the Journal of the Royal Geographical Society of London.