"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.