"We'll divide up the night into three watches of three hours each," said the captain. "I can take one watch, Dave another, and the doctor the third."
So it was arranged, and it fell to Dave to go on guard first.
"That suits me," said the young diver. "I hate to break in on my night's rest after I have once retired."
A comfortable spot had been selected for all hands. It was located about two hundred feet from the shore, where there was a series of rocks and some trees. The doctor had fashioned some brushwood into a shack, and gathered additional brushwood for bedding.
To keep himself awake Dave began to walk around the camp, and also made several trips down to the ocean front. He carried his bow and his arrows with him, to help guard against any surprise.
On his second trip down to the shore he noticed a strange fire a long distance off.
"That must be a camp-fire of some sort," he mused. "Perhaps it is that of the savages on that other island."
He watched the fire for a quarter of an hour and gradually it died away, leaving the ocean as dark as before.
It must be confessed that his day's tramping had made Dave sleepy, and it was all he could do to keep his eyes open.
"I'll be glad when it comes my turn to go to bed," he thought.