ected, he was watching
us all the time we examined that wonderful paper, and of course he
believed it to be something for which his employer would reward him
heavily, if he could only lay hands on it."

Bob himself was laughing now, as the full sense of the ridiculous
character of Frank's little joke broke upon him.

"Oh! my, think what will happen when Mr. Warringford tears open that
envelope, and sees how his spy has been fooled!" he exclaimed.

"There's only one bad thing about it, Bob!"

"What is that?" inquired the other.

"Eugene is, I take it, a clever fellow," said Frank, seriously; "and
he'll understand that this was done with a purpose. It will make him
suspect that we're onto the game, and that we know he has the half-breed
watching our every move."

"Well, what of that, Frank?"

"Nothing, only after this we may expect they'll change their tactics
more or less, and play on another string of the fiddle," the other
saddle boy replied.

"All right," Bob remarked. "Forewarned is forearmed, they say; and if we
know Eugene is laying low for us, we can be on our guard."

"Yes, that's all very good," Frank went on, shaking his head; "but once
we get into the big canyon it may pay us to keep an eye out for
overhanging rocks."

"Say, you don't mean to tell me you think Eugene would go that far?"
demanded Bob, startled at the very idea of such a thing.

"I don't like to think he would; but you never can tell," Frank replied.
"When a man like Eugene Warringford sells his soul, and with a chance of
getting a big stake, he is generally ready to shut his eyes, and go the
limit."

"But, Frank, that would be terrible! One of those rocks, coming down
from the face of a high cliff, would seriously injure us!"

"Sure it would, and on that account we must keep on the watch all the
time," Frank continued. "But I don't see Abajo anywhere about the piazza
of the hotel; do you?"

"He's gone, and I reckon to carry that wonderful find of his to the man
who employs him," Bob remarked. "Wouldn't I give a dollar to be hiding
close by when he runs across Eugene, and they open the envelope you
sealed! Wow! it will be a regular circus! Can't you imagine that yellow
face of the half-breed turning more like saffron then ever when he
learns that we played him for a softy?"

"Well, if you were near by, Bob, I wouldn't be surprised if you just had
to stick your fingers in your ears," chuckled Frank.

"I reckon they will have