The youths spent several more minutes at the bank; then they made their way back to the others.
“What’d you find?” asked Mr. Lewis.
“Only native canoes,” Bob answered. “Only——”
He stopped and listened. What was that he had heard?
Again it came to his ears, this time louder and nearer.
“Sounds like someone’s shouting,” said Joe. “Sounds like——”
“Indians!” cried Professor Bigelow. “The Indians are returning!”