More
than once he looked over to the shed where his craft was housed, as
though some danger might threaten it. But the shed of the Humming-Bird
showed no signs of invaders.
Suddenly the mysterious aeroplane increased its speed. It circled about
more quickly, and shot upward, as though to show the watchers of what it
was capable. Then, with a quick swoop it darted downward, straight for
the building where Tom's newest invention was housed.
"Look out! They'll hit something!" cried the young inventor, as though
those in the aeroplane could hear him.
Then, just as though they had heeded his warning, the pilots of the
mysterious craft shot her upward, after she had hovered for an instant
over the big shed.
"That was a queer move," said Tom. "It looked as if they lost control of
her for a moment."
"And they dropped something!" cried Mr. Jackson. "Look! something fell
from the aeroplane on the roof of the shed."
"Some tool, likely," spoke Tom. "I'll get it in the morning, and see
what sort of instruments they carry.
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