voyage. Withered heaps of parched skin and bone lay here and there, in
the distinct forms in which the camels had gasped their last. The dry
desert air had converted the hide into a coffin. There were no flies
here, thus there were no worms to devour the carcasses ; 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,