"Well, as we may have him for a neighbor for some days we shall have a chance to watch him closely," said Mr. Bell.
But in this the leader of the party of adventurers turned out to be wrong, for when they awoke the next morning the grove did not contain the professor or his red wagon. Only the ashes of his fire were there to tell of his sojourn. But on one of the trees they found pinned a note.
"Sorry to leave so abruptly, but circumstances compelled. Perhaps we shall meet again. Who knows!"
And that, for many days, was to be the last they saw of the professor. When they re-encountered him—but of the surprising circumstances under which this was to take place we shall learn later.
CHAPTER VIII
A DESERT FIGHT
There was too much before them for the party to spend much time in speculation concerning the professor's sudden disappearance. Immediately after breakfast Mr. Bell called the boys aside and said:
"How long will it take to get an aeroplane ready?"
The question came briskly, as did all Mr. Bell's speeches.
"I think I can promise to have a machine ready for flight by noon," was Roy's rejoinder after a brief interval of thought.