"And that's the bait that has drawn the old scientist here, to study it all out, and write up the history of the people who looked on this very picture so many hundreds of years back. Why, Frank, some of the cliffs they say are about a mile high! That's hard to believe, for a fact."
"But it's been proved true," the other asserted. "The trouble is, that everything here is on such an awful big scale that a fellow fools himself. Actual measurement is the only way to prove things. The eye goes back on you. Why, I've looked out on a clear day in Colorado, and believed I could walk to a mountain in an hour. They told me it's base was fifty miles away; and there you are."
"Well, we'll have to put off looking till morning," said Bob, regretfully; "because the sun's dropped out of sight, and it's getting pretty thick down there in the hole. And to think that to-morrow we'll be pushing along through that place, with the walls shutting us in on both sides."
"Not only to-morrow, but for many days, perhaps," Frank added; for more than ever did he begin to realize the enormous task that confronted them; it was almost like looking for a needle in a haystack; but if one possesses a powerful magnet, even then the bit of steel may be recovered in time.
Did they happen to know of any such magnet?
Almost unconsciously Frank's thoughts went out toward that old Moqui brave, Havasupai, who had fled from his village because of some act which he had committed; but who was now determined to return, and take his punishment with the stoicism Indians have always shown.
The Moqui might be the connecting link! He alone knew where the hermit had his lodging, possibly in one of those quaint series of cliff dwellers' homes, which for some reason he called Echo Cave.
"We must ask if our friend Sheriff Stanwix has been here," Bob suggested, as they went to their room to prepare for supper.
"Oh!" replied his chum, "I did that when I spoke with the clerk at the desk. You were looking after the ponies at the time, so as to make sure they'd be well taken care of for a week, or a month if necessary."