"I think another one came in the night," she said, when Sidney explained his belief that the boat was in hiding behind the farther walls. "I am sure I heard another voice."

Grenville recalled the shout that had followed the chanting and felt that this accounted for Elaine's conviction that more of the Dyaks had arrived.

"We have not been actually seen as yet," he assured her. "Our flag of distress is not a positive sign of anyone's presence on the island. We shall soon determine by their movements whether these chaps intend to be friendly or not."

"Would they hide if they meant to be friendly?"

"It isn't a friendly sign—— You see, I'm still of opinion the island's wail is a sound they rather dread. Have you noticed it's rapidly failing?"

"I've been ever so glad it seems so short and growing fainter."

"Yes," he drawled. "I'm afraid it will soon cease altogether, when our friends may buck up their courage and—show us their state of mind."

"What can we do in the meantime?"

"Sit tight and watch for developments."

But all that day there was never so much as a sound or a sign of the crew they had seen arrive. At one time, just before noon, Grenville fancied some movement occurred in the rocks that crowned the second hill. But he detected no further indication that someone might have scaled the cliff to spy on himself and Elaine.