er, as
though one thing that had bothered him was now explained.

"Yes, that was how it came about," answered Eugene. "We have followed
him like his own shadow for days, and yet he knew it not. Age must have
dimmed the sight and hearing of the warrior. After we saw him pass
upward, on investigating, we found the stone ladder in the crevice, and
we waited several hours for him to come down, for we wanted to make sure
of him first. As he did not appear, we finally could stand it no longer,
and began to creep up here, inches at a time. Then we surprised you, and
announced our intention of stopping with you."

"Yes," declared the scientist, bitterly. "First you pretended that you
were sent out by a magazine to search for me, and get some points as to
my great work here among the Zunis, the Hopis and the Moquis. But I soon
discovered that you had another motive in trying to find Professor
Oswald. You began to hint about your desire to possess stock in certain
mines, and especially in one, the ownership of which I had carried in my
hand for some years. Besides, I had been warned of your real intentions,
and was on my guard."

"What became of that old Moqui Indian?" went on Eugene. "He climbed up,
but he did not come down. We guarded that stairway closely every minute
of the time. We have searched every room in this rabbit burrow that we
could discover; but still he does not show up. Have you put him away in
some place, the entrance to which is hidden from our eyes?"

The only reply to this question was a scornful laugh. As Bob would say,
it was as if the defiant little professor had flashed out.

"Don't you wish you knew?"

"Well, as the document and the Moqui have both vanished mysteriously,
there's only one thing I can conclude," went on Eugene, between his
teeth; "and that is they must be together at this very moment. Produce
the one, and the other will be found not far away."

"What a wise man you are, sir!" remarked the little scientist, with a
sneer.

"Perhaps I may prove a more successful one than you imagine," returned
Eugene, between furious puffs. "Now, all the time I have been turning
this old lot of rabbit burrows upside down I've been thinking a whole
lot, Professor."

"Bravo!" exclaimed the other clapping his hands vigorously; "it will
certainly do you a great amount of good, sir, for I imagine you seldom
treat yourself to such a luxury as a good hard think. And may I inquire
concerning the result of