On its borders dwell the Garamantians, a lightly clad, agile tribe of tent-dwellers subsisting mainly by the chase. These are the only people who occasionally penetrate the desert, in pursuit of game. They wait till rain falls, about the winter solstice, mitigating the excessive heat, moistening the sand, and making it just passable. Their quarry consists chiefly of wild asses, the giant ostrich that runs instead of flying, and monkeys, to which the elephant is sometimes added; these are the only creatures sufficiently proof against thirst and capable of bearing that incessant fiery sunshine. But the Garamantians, as soon

, as they have consumed the provisions they brought with them, instantly hurry back, in fear of the sand’s recovering its heat and, becoming difficult or impassable, in which case they would be trapped, and lose their lives as well as their game. For if the sun draws up the vapour, dries the ground rapidly, and has an access of heat, throwing into its rays the fresh vigour derived from that moisture which is its aliment, there is then no escape.