33. Olivine-gabbro from hill S.-E. of Gebel Selaia 303 34. Troctolite of Gebel Um Bisilla 304 35. Pyroxene-granulite of Kolmanab Hill 305 36. Diabase from under the Nubian sandstone, Rod el Nagi 306 37. Diabase from Gebel Abu Hamamid 308 38. Olivine-diabase from a dyke at the junction of Wadis Gemal and Huluz 308 39. Diabase from a dyke in Wadi Kreiga 309 40. Mica-diabase of Gebel Um Khariga 310 41. Basalt of Gimeida Hill 311 42. Basalt of Einiwai Hill 312 43. Amphibolite from hills near Gebel Um Gunud 317 44. Amphibolite containing olivine and bronzite, Qrein Salama 319 45. Serpentine (probably from a mica-peridotite), east of Erf el Fahid 321 46. Serpentine (from lherzolite), hills near Wadi Um Khariga 322 47. Serpentine (from dunite), low hills near Bir Abraq 326 48. Serpentine (from dunite), low hills near Bir Abraq 326 49. Serpentine (from wehrlite), Gebel Gerf 327 50. Bronzite passing into serpentine, Gebel Gerf 327 51. Serpentine (from harzburgite,), Gebel Korabkansi 329 52. Crushing of quartz and felspar in granite-gneiss, Gebel Um Rasein 334 53. Diorite-gneiss, Wadi Muelih 334 54. Crushed and altered syenite (schist), near Gebel el Anbat 339 55. Hornblende schist, Wadi Muelih 340 56. Schist composed of crushed volcanic rocks, Gebel Abu Hamamid 341 57. Hornblende schist, near Gebel Eqrun 343 58. Emerald and quartz, near Sikait 345 59. Tourmaline in talc-schist, Sikait 346 60. Section of sandstone at Gebel Um Khafur 358 61. Junction of sandstone and granite, west of Gebel Um Reit 359 62. Faulting near Wadi Saalek 359 * * * * * =THE GEOGRAPHY AND GEOLOGY OF SOUTH-EASTERN EGYPT.= * * * * * CHAPTER I. * * * * * =INTRODUCTION.= * * * * * [Illustration: Fig. 1.—Sketch-Map of Egypt. The shaded area shows the district treated of in this book.]