"I don't believe there is a soul on the island besides ourselves," answered the captain.
"I can't go to sleep if there are cannibals," groaned the nervous passenger.
As late as it was, Bob, Ned and the captain took a tramp around the island. It was not over a quarter of a mile long and an eighth of a mile wide. There was fairly good walking close to the shore, but the interior was a mass of stunted trees, thorny bushes and long trailing vines, to get through which was impossible.
"I haven't seen what I'd like most to see," said the captain, after the walk was ended.
"What is that?" questioned Bob.
"A spring of good, fresh water."
"That's so—we didn't see any spring at all!" exclaimed Ned Scudd.
"Too bad! We need water."
The castaways were thoroughly tired out, and that night all went to bed and slept soundly. Nothing came to disturb them, although at daybreak Mr. Tarbill leaped up in alarm.
"Hark!" he cried. "Somebody is coming! It must be the cannibals!"
"What!" exclaimed Captain Spark, and he jumped up, followed by the others.