Tom Swift well realized that he must make his best speed while in the air. Though his craft could do fairly well on land or in the water, the less actual distance he had to travel on aqua pura or terra firma the better chance he would have of winning the race. His most feared rival—Kilborn in the Red Arrow—could travel only in the air, and would keep to that medium. Though of course, having a hydroplane, he could, to a certain extent, move over the water.

“But the race will be decided by air travel,” said Tom, and to this end he determined to devote all his energies.

It was shortly after noon, when Brinkley had served an appetizing meal in the little cabin, that Peltok, who had been told by Tom what course to follow, announced that they were approaching Yarkand.

“Land there!” ordered Tom. “I don’t know just how near our oil and gas supply in Yarkand is to our landing field, but pick out the best spot and we can have the supplies brought out to us.”

“Right!” exclaimed the navigator, and a little later the big craft came to a gentle stop on a big plain on the farther edge of which was the city.

No sooner had the Air Monarch landed than she was surrounded by a swarm of curious natives, a sort of a cross between a Chinese and an Indian, Ned declared. They were friendly, however, and laughed with glee as they beheld the “foreign devils” and their queer craft.

Here Peltok’s linguistic abilities were useful, for he was soon talking with the natives “like a house afire,” as Tom said, and in a little while the interpreter announced that he had arranged for Tom’s supply of oil and gas to be brought out.

“Then sha'n’t we take this chance to stretch our legs?” proposed Tom to Ned. “We’ll walk about a bit and the mechanics will have time to tune up the motors. I don’t like the way the starboard one is behaving.”

He gave his instructions to Brinkley and Hartman, and then, with Peltok looking after things, uttering dire threats in their own language to the Turkestan natives, who seemed to want to pull the machinery apart, Tom and Ned strolled about. They would have about an hour to wait, and decided to go into the ancient city.

As they were entering it, Ned pointed off to the left and uttered a cry of surprise.