Harrowbrook grounds that they were practically out of the race. The
contest lay between the Buzzard and the Golden Eagle.

Suddenly, as they were racing high above a road that showed far below
them like a bit of white ribbon. Harry uttered an exclamation and
pointed downward.

Directly beneath them an automobile was moving along, and as Frank
gazed downward for a fraction of a second he saw a man, seated in the
tonneau, place a glittering object to his shoulder.

"Zi-i-i-p!"

Something that sounded like a big bee sang by the boys' ears.

"A bullet!" cried Harry.

"They are shooting at us!" exclaimed Frank.

"I know that automobile," suddenly cried Harry, "it's Luther Barr's."

"So it is."

"And," shouted Harry, bringing his glasses to bear on the car, "the
man with the rifle is that sneak Sanborn."

Before Frank could reply another bullet sang by them.

This one ripped a hole in the upper plane, but fortunately a hole of
such size did not affect the machine.