"Jes' stick this bit of advice in your craw, son," advised Cal as he went briskly about his tasks, "work's the thing that trouble's most scart of, so if ever you want to shake your woes pitch in an' tackle something."

While Nat's comrades are thus employed, let us see for ourselves what has become of the lad. We left him listening intently to some approaching horsemen. He remained in this attentive attitude only long enough to assure himself that they were indeed coming toward him, and then, like a flash, his mind was made up.

It was clear to the boy that travellers in such a remote part of the Sierras were not common. It also came into his mind that Col. Morello's band was reputed to have their hiding place somewhere in the vicinity. The brief glance about him that Nat had obtained had shown him that it was just the sort of place that men anxious to hide themselves from the law would select. In the first place, it was so rugged and wild as to be inaccessible to any but men on foot or horseback, and even then it would have been a rough trip.

The valley, or rather "cut," in the hills, up which the sound of hoofs was coming, was, as has been said, narrow and deep in the extreme. From the summits of its cliffs a defence of the trail that lay beneath would be easy. Stationed on those pinnacled, natural turrets, two might, if well supplied with ammunition, have withstood an army. All these thoughts had occurred to Nat before he made his resolution—and turning, started to run.

But as he sped along a fresh difficulty presented itself. The hillside at this point seemed to be alive with blue-jays. They flew screaming up, as he made his way along, and Nat knew that if they had acted as a warning to him of approaching danger the vociferous birds would be equally probable to arouse the suspicions of whoever was coming his way.

He paused to listen for a second, and was glad he had done so. The horsemen, to judge from their voices, had already reached the spot upon which he had been standing when he first heard them. What wind there was blew toward him and he could hear their words distinctly.

"Those jays are acting strangely, Manuello. I wonder if there is anybody here."

"I do not know, colonel," was the reply from the other unseen speaker, "if there is it will be to our advantage to find him. We don't want spies near the Wolf's Mouth."

"Wolf's Mouth," thought Nat, "If that's the name of that abyss it's well called."

"You are right, Manuello," went on the first speaker, "after what Dayton told us about those boys I don't feel easy in my mind as long as they are in our neighborhood. If Dayton and the others had not miscalculated yesterday we shouldn't have been bothered with them any longer."