„ V. — The Wadis draining Eastwards to the Sea 94 „ VI. — The Mountains and Hills 164 „ VII. — Water Supplies 234 „ VIII. — Geology.—Sedimentary Rocks 251 „ IX. — Igneous Rocks 262 „ X. — Metamorphic Rocks 331 „ XI. — Tectonics and General Geology 354 „ XII. — Tribal Boundaries 366 „ XIII. — Notes on the Road from Halaib to Port Sudan 372 INDEX 379 * * * * * LIST OF PLATES. * * * * * Plate. To face page I. — Orographical Map of South-Eastern Egypt FRONTISPIECE. II. — Sketch Map showing Drainage Basins 22 III. — Sketch Map showing Water Sources and Roads 26 IV. — Views of Ruins at Um Eleiga and in Wadi 30 Shenshef V. — Views of Tomb of Sheikh Shadli and Bir Shadli 32 VI. — Map of the District of Nugrus and Sikait 106 VII. — Summit Views of Gebels Nugrus and Abu Hamamid 166 VIII. — Views from Gebel Migif 168 IX. — Descending Gebel Zabara 170 X. — Views from the Summit of Gebel Atut 172 XI. — Views in Wadi Muelih and of Gebel Selaia 172 XII. — Typical Views among the Mountains of Hamata and Abu Hamamid 176 XIII. — Views on Gebel Kahfa 178 XIV. — Views of Gebel Kalalat and the Summit of Gebel Faraid 192 XV. — Map of the District of Abraq and Abu Saafa 202 XVI. — Panoramas from the Summits of Gebels Niqrub and Gerf 206 XVII. — Map of the District of Gebel Gerf 210 XVIII. — Map of the District of Meisah and Wadi Di-ib 218 XIX. — Map of the District of Elba and Halaib 226 XX. — Geological Map of South-Eastern Egypt 250 XXI. — Geological Map of Ras Benas 258 XXII. — Acid Igneous Rocks 268 XXIII. — Intermediate Igneous Rocks 284 XXIV. — Basic and Ultra-basic Igneous Rocks 300 XXV. — Metamorphic Rocks 334