That the "Benson" was slowly losing was not, at first, clear to anyone on board. It took time to draw out the increasing lead of the other craft, but, after a while, it became more and more evident.

True, the "Benson" was second in the line—but the "Zelda" was first.

At the end of an hour there were drops of clammy ooze on Captain Jack's forehead. He was steering as well as he had ever steered in his life. Hal had sent up word that the "Benson's" engines were doing all that could fairly be required of them.

That troublesome hour up, Captain Jack called to Eph to take the helm.

A few moments later the youthful commander appeared again on the platform deck, carrying a range-finder on a tripod. Through the telescope he took some rapid sights, then did some quick figuring. When he looked up Benson saw Jacob Farnum standing within four feet of him. The shipbuilder's face looked gray and haggard.

"How much?" asked Jacob Farnum.

"Shade more than a quarter of a mile in the lead of us, sir," Jack replied.

"Have you been down to talk to Hal?"

"What's the use, sir?" demanded Jack. "Hal Hastings knows how much depends on speed. He's doing everything that his engineer's conscience will allow. Besides, David Pollard is there with him, sir."

"I've no orders to give," Jacob Farnum sighed, stepping back. "You youngsters know what you're about, and how much depends upon our success to-day."