. The earth and its inhabitants .. . E .of G r^een \/^ich 60 Miles. of primitive rocks, such as granite, gneiss, and crystalline schist ; towards the south alone the system presents extensive limestone formations. Rising gradually from the south to the north, it culminates in the Jebel-Olba, which, according to Wellsted, exceeds a height of 8,000 feet. Connected at this point with the mountains of the interior by lateral offshoots, the chain again falls in a north- westerly direction. At Mount Irba (Soturba) it attains a height of 7,010 feet, and at Moimt Elba, the Etbai properly so-called, it

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. The earth and its inhabitants .. . E .of G r^een \/^ich 60 Miles. of primitive rocks, such as granite, gneiss, and crystalline schist ; towards the south alone the system presents extensive limestone formations. Rising gradually from the south to the north, it culminates in the Jebel-Olba, which, according to Wellsted, exceeds a height of 8,000 feet. Connected at this point with the mountains of the interior by lateral offshoots, the chain again falls in a north- westerly direction. At Mount Irba (Soturba) it attains a height of 7,010 feet, and at Moimt Elba, the Etbai properly so-called, it rises to more than 4,080 feet, that is, about the same height as the Jebel-Farageh, the Pentodactyle of the ancients, lying farther north, and which Schweinfurth vainly attempted to scale. In certain places the base of these escarpments is washed by the waters of the Red Sea,

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