All travelers to Bagdad had to pass through it.
They remained there until the following day, when the coon descried some camels approaching.
In an hour the caravan reached them, and our friends saw that they were the very men they wanted.
But there were only four in the party.
Each man rode a camel.
As they drew near the airship Frank and his friends, armed with rifles, confronted them.
“Halt!” cried the inventor.
The Arabs gave a shout of fear.
At one glance they recognized the adventurers.
Instantly the camels were stopped and one of them yelled: