“I was going across to do that, Frank,” said the doctor, as the young man returned to his own party. “It is not good for him to be exposed like this, but these people are so accustomed to the desert life that they bear with impunity what would kill an ordinary Englishman.”

“How much longer have we to wait, Ibrahim?” asked the professor.

“We shall begin loading in less than an hour, Excellency,” replied the Sheikh, “so as to have plenty of time.”

“Is everything packed?”

“Yes, Excellency.”

“Nothing forgotten?”

“I have been over the baggage twice, Excellency, and nothing has been left; the camels are all in beautiful condition, and there is an ample supply of water, for I have had four extra skins filled. We may want it, for the journey to-morrow will be over the hot, fine sand. I daresay, though, we shall halt for a few hours in the middle of the day.”

Soon after there was the busy sound of loading going on, the soft silence of the night being broken by the querulous moaning and complaining of the camels as burden after burden was balanced across their backs, the uncanny noise sounding weird and strange, the weirdness applying, too, to the dimly seen, long-necked creatures, which rapidly grew into shapeless monsters writhing their long necks and snaky heads as seen in the darkness, till they looked like nothing so much as the strange fancies indistinctly seen in some feverish dream.

So well had the preparations been made that an hour amply sufficed for the loading up, and at the end of that time the two troops of camels were standing, each with its own drivers, a short distance apart, and nothing remained but for those who rode to mount and the order to be given for the start.

It was just then that a tall, dark object, the one for which the doctor had been anxiously looking, loomed up from the Baggara camp and stalked silently up to where the Baggara chiefs son lay waiting upon his rug.