Dick paused suddenly, listening keenly.
"Do you fellows hear that?" he whispered.
"I hear a rumble of wheels off in the distance," replied Greg. "The air is so wonderfully still that sound carries a long way this evening."
Dick ran into the tent, returning with an envelope and a pad of paper.
"Come along, Dave," Dick requested. "And you'd better bring Tom's flashlight. It will be dark before we get back."
The battery of the flashlight having had a good rest, now furnished an excellent light again.
As the two chums set off at a trot Greg inquired:
"Now what are that pair up to?"
"Being one of the four pin-heads belonging to this outfit," Tom made solemn reply, "I can only guess."
"Then what's your guess?" quizzed Danny Grin.