"Let's go and follow up those footprints at once," suggested Andy.
The others were willing, and in a short space of time they were on their snowshoes and making their way through the woods in the center of the island.
"Hello! here's something!" cried Jack presently, and pointed to the old lumberman's snowshoes, where they still rested among the branches of a tree.
Then the boys saw where he had climbed between the rocks, and, taking off their snowshoes, they followed the footprints.
"A cave!"
"What do you know about that!"
It did not take the lads long to reach the entrance of the cavern. Then Jack, who had brought along one of the flashlights, turned it on and entered, followed by his cousins.
"Hello, Uncle Barney!" he cried out at the top of his lungs. "Uncle Barney! are you here?"
"Help! help!" came feebly from the inner end of the cave, and, guided by the flashlight, the four Rovers ran in that direction. They found the old man sitting on a rock with his head resting on his arm.
"Are you hurt? How did it happen?" questioned Jack quickly.