Davis' expression became keen and rather stern.
"We've four hours before dark. We'll have to set to work."
Teddy went over and stepped up the ladder that leaned against the cockpit.
"I want to see your gasoline supply," he remarked. In a moment he came down, looking a trifle dubious. "If I'm right about Varrhus using liquid hydrogen for a weapon, and we can set it afire, we'll dive through half a dozen sheets of flame to-night. Something will have to be done to protect that gas tank from catching fire, and some protection for the carburetors, too."
"We'll fix that in a hurry," said Davis briskly. "Oh, Simpson! Come here!"
In twenty minutes there were half a dozen mechanicians at work, and Teddy was carefully inspecting the machine gun at the bow of the fusilage.
Teddy telephoned back to Evelyn what he anticipated would occur that night and his own share in it.
"Of course there's some risk in it," he finished, "but I guess we'll come out."
Evelyn's voice was more anxious than Teddy had expected.
"Do be careful, Teddy," she said in a worried tone. "Please be very careful. Varrhus has so many fiendish weapons. I'm terribly afraid."