For answer Roger puckered up his lips, and emitted a peculiar little trill. Should any one not familiar with it hear this sound, he would naturally imagine some bird was calling to its mate.
All of them stood there, eagerly waiting to discover if Roger’s note called forth any response. Before ten seconds had passed there came a faint whistle, very like that which the boy had given.
“There, did you hear it, Dick?” gasped Roger, turning a flushed face toward his cousin, while his eyes sparkled joyously.
“I heard a sound that might be just such a whistle as Jasper taught us,” replied cautious Dick; “but don’t build too many castles in the air, Roger, or you may be disappointed. Try again!”
Roger was only too willing to do so, and there was an immediate reply this time, that all of them heard plainly.
“He’s coming this way, I do believe, for that was closer than before. Shall I give him another call?”
“Yes, it can do no harm, and we must know the truth, at any rate.”
When the next answer came back it was beyond all doubt nearer than any that had preceded it.
“Oh! we shall soon see him!” cried Roger, fixing his eyes on the spot, as near as he could calculate, whence that last reply had come. “Now, keep watching, both of you, while I signal to him again that the coast is clear.”