"What do you know about that?" demanded the boy.
"Well, we got him to say something," sighed the girl.
"But—but it doesn't mean anything. 'Outlaw,' indeed! Does he mean to tell us that there is a Mexican bandit, for instance, out there whistling?"
"How foolish!" laughed Nan. "Of course not."
"Then, Miss Sherwood, please explain," commanded Walter.
"You'd better ask Mr. Hesitation Kane to explain."
"And get another cryptic answer? No, thanks! I want to know—There it is again!"
The sound was closer. Nan suddenly laughed.
"Why," she cried, "I know what it is. It's a horse—a wild horse.
Of course!"
"But he said 'outlaw.' Oh!" added Walter suddenly, "I know now. Some of the wild stallions never can be tamed. I've read about them. Of course, it is a stallion. We heard them calling day-before-yesterday.