With one of the smallest of his bombs, and carrying one of his firebrands only for a torch, he once more descended, feeling his way along the wall, eager to regain the lower entrance, lest it might be already discovered. He had been delayed in securing the brand, without which his bomb was useless. He had told Elaine his measures were only of defense. They were hardly even that. When he came to the door he could see no torch, for the Dyaks had gone, in new exasperation, and their voices echoed back from the ledge. The impulse to rush out thus belatedly, ignite his fuse, and hurl his engine of destruction upon them, or their boat, was one he curbed with difficulty, at the dictates of sober sense. For a dozen reasons the maneuver might fail to destroy the murderous trio. And should one escape to advertise the fact he was somehow concealed in the cavern, no possible cleverness could avail to protect Elaine or himself. Should a larger number come to the cave---- But he knew it was hardly likely, now, that even a few would return. If the Dyaks had, as he felt convinced, concluded that the open niche meant that the tomb had been pillaged, that the treasure was gone, either taken by himself or another, they would have no conceivable reason left for courting disaster here again. For unless they should dare approach the place by night, it was only under cover of the rolling smoke they would risk attack from above. He even thought of hastening back to the terrace now to drop a bomb upon them. It was only a recollection of the all-engulfing smoke that halted this intent. Instead he dislodged the wooden bar, removed the door to his secret gallery, and crept out to glide to the breach in the ledge for a possible view of the boatmen. Only the disappearing end of their craft was shown through the fumes that veiled the tide. It was Grenville's useful catamaran, as he instantly discerned. A new resentment burned in his blood, but left him as helpless as before. CHAPTER XXXVIII GRENVILLE'S DESPERATE CHANCE At noon Elaine reluctantly consumed the last remaining drop of water. Grenville had taken a sip, and pretended to take a swallow. To refuse it longer, Elaine quite clearly comprehended, would be but to see it ooze away through the jar, to be drunk by the merciless heat. "I shall get a new supply," said Sidney, attempting an accent of cheer, "but I'd rather avoid using that of the cavern, for fear it may not be wholesome." Elaine, in her way of divining the truth, was only partially deceived. She felt that the water below in the cave was wholly unfit for consumption. She knew that if anything even remotely possible could be done to refill their vessels, Sidney would have filled them long before.