Personally she was consumed with sleepiness.

He produced a revolver.

"Do you mind if I fire a shot to test these cartridges?" he inquired.
"The powder is all right, but the fulminate in the caps may be
damaged."

She agreed promptly. He pointed the weapon at a cluster of cocoanuts,
and there was a loud report. Two nuts fell to the ground, and the air
was filled with shrill screams and the flapping of innumerable wings.
Iris was momentarily dismayed, but her senses confirmed the sailor's
explanation--"Sea-birds."

He reloaded the empty chamber, and was about to say something, when a
queer sound, exactly resembling the gurgling of water poured from a
large bottle, fell upon their ears. It came from the interior of the
grove, and the two exchanged a quick look of amazed questioning. Jenks
took a hasty step in the direction of the noise, but he stopped and
laughed at his own expense. Iris liked the sound of his mirth. It was
genuine, not forced.

"I remember now," he explained. "The wou-wou monkey cries in that
peculiar warble. The presence of the animal here shows that the island
has been inhabited at some time."

"You remember?" repeated the girl. "Then you have been in this part of
the world before?"

"No. I mean I have read about it."