ABSTRACT
Soon after leaving Wadi Himem we ascended the mountains for the best part of a day until we reached the flat highland summits, the desert of stone, that forms the prostrate thorax of Arabia. These tablelands of Djebel and Djol attain their maximum height in the Yemen, a mountainous zone fifty miles in width rising steeply on the sea side to 9,000, and then forming a plateau zone of more than a hundred miles sloping gradually to the great Jahna desert, or Rub el Kali. In the Hadhramaut the zone is less wide and high, but is stilI part of the mountain chain buttressing the interior and shutting it off from the sea.
