"I've done my best," Jimmie said, in a discouraged tone.
Frank Shaw smiled and dropped down behind a huge rock.
"Just wait a minute," he said. "Just wait until I catch me breath, and I'll put him wise to the fact that there's a Black Bear somewhere in this turned-up-on-edge country. Watch, and see him jump."
Frank put his hand to his throat and emitted a growl which would have done credit to a genuine black bear, a bear in a museum warning the inquisitive to keep away from his cage. The threatening sound, however, seemed to come from the other side of the slope where the prisoner stood.
The Englishman drew a revolver and glanced sharply around, while the outlaws seized their guns and held them ready for action. It was clear to the boys that they had been completely deceived by the signal, and were expecting an attack from the animal at any moment.
Fremont did not seem to notice the signal, which was one the members of the Black Bear Patrol had long practiced both in the forest and in their club room, but his eyes were for an instant lifted toward the hiding place occupied by the three boys.
"He's next," whispered Fenton.
"I should say so," grunted Frank. "I guess he'd know a Black Bear signal anywhere. We didn't learn that call by any correspondence school method. It is the genuine thing. We got it by dodging the keepers and stirring up the black bears at Central Park."
The outlaws were now making timid runs out toward the point from which the sound had come, and the boys thought best to drop back a short distance, still keeping Fremont in sight, however. Directly the outlaws assembled again and stood talking in the villainous lingo which they had used before. It was evident that they were not a little alarmed at the thought of a wild animal being so close to them.
"They'll think there's more than one Black Bear after them," Shaw whispered as the men turned down the eastern slope and again moved toward the desert-like plain which lay between the mountains and the river.