s; but the usual
sextons were the crows, although sometimes too few to perform their
office. These were perched upon the overhanging cliffs; but no sooner
had our overworked camels taken their long draught and lain down
exhausted on the sand, than by common consent they descended from their
high places and walked round and round each tired beast.

As many wretched animals simply crawl to this spot to die, the crows,
from long experience and constant practice, can form a pretty correct
diagnosis upon the case of a sick camel. They had evidently paid a
professional visit to my caravan, and were especially attentive in
studying the case of one particular camel that was in a very weakly
condition and had stretched itself full length upon the sand; nor would
they leave it until it was driven forward.

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 toward 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 hike 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.

During our march the simoom was fearful, and the heat so intense that it
was impossible to draw the guncases out of their leather covers,
which it was necessary to cut open. All woodwork was warped; ivory
knife-handl