THE EDGE OF THE UNKNOWN _Frontispiece_ FACING PAGE IN AGADES 4 NATIVE FOOD FOR THE LONG TRAIL 6 AN ORDINARY NIGHT CAMP 12 THE LONG, EXACTING MARCH 16 NOMAD AND CAMEL-MAN 20 THROUGH TO WATER AND RESTING 28 BRANDED 34 ALL MY COMRADES CARRIED STRANGE BOXES 36 MY NEW MASTER RODE ME ALL THAT DAY— 38 —AND THAT WAS THE BEGINNING OF A GREAT FRIENDSHIP 38 HE STROKED ME OFTEN 42 A NOOK IN THE MOUNTAINLAND OF AÏR 50 SALT-BUSH 52 DISINTEGRATING ROCK 52 A DESERTED STONE-BUILT VILLAGE 54 TYPICAL TASSILI 58 A DEEP RAVINE IN TASSILI 60 A SAHARAN RIVER-BED 62 A CORNER OF THE CAMP AT TABELLO 72 FOOD FOR CAMELS 78 GLIMPSES OF THE TARALUM 80 PART OF THE TARALUM CAMPED 82 AMONG SAND-DUNES 86 THE TOLL OF THE DESERT 86 EFALI 90 A DOORWAY IN FACHI 96 THE “SEVEN PALMS” 96 THE RAMPARTS 98 A TOWN BUILT OF SALT 100 SHADOWS AT EVERY TURN 102 WOMEN OF FACHI 104 THE DEN OF THE FORTY THIEVES 106 THE SALT-PITS OF BILMA 114 SETTING THE SALT 116 MEN OF THE OASIS 118 FROM THE ROOF-TOPS THEY WATCHED 122 THE SALT-PANS OF TIGGUIDA N’TISEM 124 SALT OF TIGGUIDA 126 THE VEIL 132 A TUAREG WOMAN 134 A MAIDEN 138 TUAREG LADS 140 A TUAREG HOME 144 EATING FROM THE ONE DISH 146 A TUAREG VILLAGE 150 THE WELL-HEAD 150