he walls have ears, they say; and if the
police were suddenly called back from their hunt to the southwest, the
fact might get to the robbers; and you know what would happen then."

"Oh!" said Andy, shrugging his shoulders, "I suppose they'd just throw
this second job up, and cut stick for Canada, as fast as they could
make the aeroplane spin, which would be too bad for Chief Waller, and
Joe Green, and the rest of that bunch at Headquarters, who are already
figuring on how they'll spend their reward money they hope to get when
the bank pays for rounding-up the two thieves."

"But, perhaps, if we just told our fathers, Andy, they might get a few
bold men together and lay a beautiful trap for the fellows so that when
they broke into the pay-car, they would be made prisoners."

"Bully idea, that, Frank, and I hope you decide to carry it out. Just to
think what a pleasant surprise it would be for our butterfly collector,
expecting that he was going in to gather in another lot of plunder, and
then to hear a voice say to him: 'Hands up! you're our prisoners!' Oh!
wouldn't I like to be Johnny-on-the-spot when that happens. Wonder if
they wouldn't let us have a part in the proceedings, after we brought
the news that upset the plans of the yeggmen?"

"That will do for just now, Andy, because here comes Sally again. Let's
be gaping at the wonderful collection that almost cost the professor his
very life in all sorts of hot countries, as well as a whole pocket full
of money--if you don't care what you say."

And when the farmer's daughter did enter the room a minute later, she
saw the two boys standing there, a rapt look of admiration and envy on
their faces, as they stared at the little case of common local
butterflies which possibly some boy had gathered together, and then
disposed of for a song.

While the young aviators had in this fashion about decided on their plan
of action, they saw no reason for any hurry. The day was still long, and
when they felt like starting toward home it would take them but a very
short time to get there.

Meanwhile, there seemed to be some sort of fascination holding them to
the neighborhood of the Hoskins' farm. And when they went away a little
later it would be with the idea of hanging about, and seeing if the odd
little professor might not come along. Both of them thought they would
like to look at him. The man who was capable of playing such a clever
game as this must surely be worth see