of "conquer," which Andy remembered so well;
where the rival aviator dared to go they must follow, or acknowledge his
superiority as a bold airman, something neither of them felt like doing.

Frank had figured it all out while he was speeding along so smoothly.

So far as he could see everything was working as easily as could be; the
motor never missed, and was running like a charm, just as though it
could keep this up everlastingly in an endurance test. And besides, the
wind, what there was of it at present, seemed to favor them most
positively, because it was at their backs.

So far as appearances went the conditions were ideal for the crossing of
the great lake that was now showing up ahead most grandly.

Andy drew in big breaths, and tried to keep from quivering with delight,
mingled with just a little nervousness. Here was a new experience about
to come to them; and one that they were not apt to soon forget. As a boy
Andy delighted in novel sensations; and as an ambitious aviator he
yearned to experience all the glorious possibilities that open up to the
one who has the pluck and the nerve to attempt them.

They could see a town in plain sight, though they had gradually ascended
since Andy cast his bomb so successfully. Perhaps his little game of
opening communications with the earth below had been observed by one of
those in the leading airship; and in order to prevent another attempt,
this gradual ascent had been immediately carried out.

But Frank fully expected to see the rival aeroplane begin to drop as
they drew near the border of the fresh water sea. Since just then there
was no squally wind near the surface of the water, which they wished to
avoid by remaining thousands of feet high, the chances were that Casper
Blue would soon commence to use his deflecting rudder, and begin to
descend in wide spirals; or else, with the daring of an old and skilled
air navigator, shut off power, and volplane down in a slant that would
thrill any spectator as nothing else could, until the required distance
had been covered, when he would again bring the shooting aeroplane on a
level basis, and resume his forward progress.

Whatever he did Frank was ready to imitate.

He had the fullest confidence in his own ability to accomplish the most
difficult feat that would be required.

"Steady yourself, now, Andy," he cautioned; "because they're going to
change the going pretty soon, I take it. Better put that glass away, an