that their orders
had been to stay as long as Frank and Bob did; so they also took up
their quarters in the apartments that went to make up what the little
old gentleman had called Echo Cave.

The two sheriffs took their prisoner away, to place him in some secure
nook while they continued their search for the pair of scoundrels whom
they had hunted so long, and were determined to get this time.

As they will not be seen again in this story it may only be right to say
that Frank afterwards read an account in a paper of how the sheriffs
finally rounded up the Arizona Kid and Big Bill Guffey, arresting them
after a warm resistance in which all of the participants were wounded.
And in due time doubtless the bad men who had so long defied the law,
paid the penalty for their various crimes.

The saddle boys certainly did enjoy the few days they spent with the
queer little hermit, while he completed his odd business in the rock
dwellings of the ancient cliff men.

They found the echo which had caused him to give the place its name, and
spent many an hour amusing themselves with its astonishing power to send
back sounds.

Finally Havasupai made his appearance, bearing with him a receipt, which
proved that the precious packet had been sent by registered mail to
Circle Ranch.

And then the professor announced himself as ready to take his departure
from the scene of his two years' labors as a hermit, working in the
interests of science.

"It's a wonderful old place," Bob declared as they took their last look
at the Grand Canyon from the bluff in front of the hotel, ere mounting
their horses and starting back home across the many miles that lay to
the south and east before Circle Ranch might be reached.

"Yes, and we'll never forget what we've seen here," added Frank.

"Not to speak of the adventures that have come our way," remarked Bob.
"Tell you the truth, Frank, I'll be mighty sorry when our trip is over,
because I reckon it'll be a long time before we have another chance for
such a great gallop."

But although of course he did not know it just then, Bob was very much
mistaken when he made this prophecy. It happened that events were
shaping themselves at that very hour in a way calculated to call upon
the saddle boys to make another venture into the realms of chance, and
mounted upon their prized horses too. What these events were, and how
well Frank and Bob acquitted themselves when brought face to face with
new