with; this continues for about three miles of the route, but it
is of impure quality, with the exception of one vein, of a
beautiful blue colour. A few miserable stunted thorny mimosas are
here to be seen scattered irregularly, as though lost in this
horrible desert."

Many years ago, when the Egyptian troops first conquered Nubia,
a regiment was destroyed by thirst in crossing this desert. The
men, being upon a limited allowance of water, suffered from
extreme thirst, and deceived by the appearance of a mirage that
exactly resembled a beautiful lake, they insisted on being taken
to its banks by the Arab guide. It was in vain that the guide
assured them that the lake was unreal, and he refused to lose the
precious time by wandering from his course. Words led to blows,
and he was killed by the soldiers, whose lives depended upon his
guidance. The whole regiment turned from the track and rushed
towards the welcome waters. Thirsty and faint, over the burning
sands they hurried; heavier and heavier their footsteps
became--hotter and hotter their breath, as deeper they pushed
into the desert--farther and farther from the lost track where
the pilot lay in his blood; and still the mocking spirits of the
desert, the afreets of the mirage, led them on, and the lake
glistening in the sunshine tempted them to bathe in its cool
waters, close to their eyes, but never at their lips. At length
the delusion vanished--the fatal lake had turned to burning sand!
Raging thirst and horrible despair! the pathless desert and the
murdered guide! lost! lost! all lost! Not a man ever left the
desert, but they were subsequently discovered, parched and
withered corpses, by the Arabs sent upon the search.