By the Scientific Expedition to the Northern Etbai, despatched by his Highness the Khedive in the beginning of the year, that part of the eastern desert of Egypt which lies south of a line between Kina and Kosair and reaches rather below the twenty-fourth parallel of latitude, was rapidly examined and surveyed. The map is in the hands of the engraver of the Royal Geographical Society; the geology exhibited in a map and sections is before the Geological Society; and a map of the antiquities is attached to the present memoir. The country embraces an area of 23,000 square miles of mountain and desert, and is called by the inhabitants the Northern Etbai.