“Oh, Dave, you can’t hope to do that!” exclaimed his young assistant.

The manager and a helper visited the five machines while the rules of the contest were being read by his secretary. The barograph of each biplane was examined, sealed up and put in place. Three hours was the time limit allowed, the pilots to select their own course.

There was some cloudiness, but no wind, and the five machines made a splendid initial rise. The Whirlwind was all for speed. Dave took it more slowly. Within fifteen minutes the five crafts were scattered to all points of the compass. They became mere specks as a lower strata of cloud haze obscured them. Then they vanished from view as a denser upper cumulus enveloped them.

At eleven o’clock one of the contestants came back to the grounds because of a break in the control. A comrade competitor gave up the contest a quarter of an hour later. Number three reported itself out of the race at noon.

“It’s the Ariel and the Whirlwind,” went the rounds of the stand. Everybody was wrought up to a great pitch of doubt and suspense. The clouds still obscured all sight of the clear sky.

“There’s one of them!” burst out a voice and there was great excitement as an air craft came sailing swiftly into view.

“The Whirlwind,” spoke a man with a pair of field glasses.

The Syndicate machine came to anchor as Worthington and his allies rushed toward it. Valdec stepped out of the biplane smiling and profuse in his bows. He joked and laughed as the expert removed the barograph, hastened to the judges’ stand and then placed it in a strong tin box and locked it in.

“Here’s the other!” The shout announced the Ariel. In about twenty minutes the boys and Mr. Brackett were crowding about it. The machine was dripping with moisture, and as it touched the ground its pilot removed his head gear, and fell over to one side, gasping for breath.

“He’s collapsed!” exclaimed an attendant and ran for water. They lifted Dave out of the machine. Mr. Brackett and Hiram supported him. The expert had removed the barograph. They made Dave swallow some water, rubbed his hands, and finally he opened his eyes. He smiled vaguely.