"Guess we'll have to be ready for anything from him!" Harry said, with his eyes still at the glasses. "They're evidently trying to do something up there. The passenger is working away at a part of the machine!"
"What does he seem to be doing?" Jimmie inquired.
"I can't tell from here, but I can see him apparently adjusting something. He seems to be quite busy about it, whatever it is!"
"Maybe he's preparing a bomb or something to drop on us!"
"He's dropping his wrench or something!" cried Harry excitedly. "I can see something flashing in the sunlight as it drops from the bottom of his chassis. There, he's dropped another," he continued.
"What can it be?" wondered Jack. "He can't be dropping tools."
"I see the flash of some more!" announced Jimmie excitedly.
"Why, there are lots of them!" was Harry's astonished statement. "If we don't look out some of them will hit us! Any more speed, Ned?"
"Lot's of it," reassuringly answered Ned, gazing upward at the other machine, now almost overhead. "It puzzles me, though, what that fellow is dropping. It can't be he had ballast and wants to discharge it."
All the boys were intently observing the oncoming monoplane as it appeared to be following a course at some distance above their own level. The curious flashes of light, as if from falling objects, caused them considerable wonderment. Not for long were they left in doubt.