“His mind is wandering,” said Ned as he hurried to his chum’s side. “He fancies he hears some one calling.”
At that moment there came a voice from out of the darkness. A voice sounding far away.
“Boys! Where are you?” came across the water.
“What’s that?” cried Jerry.
“The professor!” exclaimed Ned. “It’s his voice!”
Jerry sprang to the engine and set it in motion.
“We’re coming!” yelled Ned.
Jerry opened the muffler and the sound of the motor’s explosions sounded loud on the still night.
“He’ll hear that better than he will our shouts,” he remarked, as he steered the boat toward where the camp had been.