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.
"There's a Wolf after them, too," grinned Jimmie.