Two days later, none the worse for their unique experience, the airship boys arrived at Cairo. The Comet seemed to be no particular novelty to the crowd which greeted its arrival in the center of a great public square. They greeted the machine and its crew, however, with cheers. Dave left the machine in charge of his assistants, who were kept busy answering questions from the curious bystanders.

It was nearly an hour before Dave returned. He arrived seated on a wagon containing new fuel and food supplies for the Comet.

“Going to make any kind of a stop here, Dave?” inquired Hiram.

“Not a minute longer than it is necessary,” was the speedy reply. “We are third in the race, fellows, and that means no delay.”

“Yes,” nodded Elmer excitedly, “a man in the crowd speaking English said he knew we were one of the machines in the international race, and that two others had reported here at Cairo and had left again.”

“That is true,” answered the young airman. “Number seven is three days ahead of us, number eleven, six hours. Help get things in order, fellows. We can’t afford to lose any time now.”

When the Comet started up again the cheers and good wishes of the crowd were renewed. Dave made a fifty-mile run, came down in a lonely spot, and at once brought out the route charts.

“Look here, fellows,” he said, his finger tracing a course across the map; “there are three routes to choose from. From Morocco, the Azores, or Senegal; the Cape Verde Islands, St. Paul Island, and Cayenne. Those are the routes most talked about at the start. They are favored because they are the farthest north and the most direct. I have a better, a least safer, idea.”

“I’ll warrant you have, Dave, if it’s to be found,” declared Hiram.

“What is it?” inquired Elmer.