It would hardly have been human of Grenville not to wonder about the cave or to contemplate a visit there—just to have the merest look about the place. He even went so far as to wonder if its entrance might not be effected from the upper brink, by means of a longer rope ladder than the one he had already made.
He did not, however, seriously contemplate delaying affairs more important to gratify this whim. Indeed, he was fired with new impatience to work night and day against the hour of escape. The thought put him back on his feet, then and there, with the documents stored away. There was no time to lose—not a moment—not even to fool with the tiger!
He left his bomb and its fuse upon the rocks, and carried the water to his clay. To line his hollow-tree furnace as promptly as possible must be his first concern. No boat could be made without suitable tools, and—— He wondered how he should make it, even then.
The log he had found on the day they arrived was such a huge affair to attack with the implements his limited craft made possible, despite all the bronze he could melt. And yet, without it, he was helpless. The raft was far too clumsy for propulsion. It afforded practically nothing transformable into a boat, as he had no nails, no saw, no anything with which it might be first dismembered, and finally reconstructed.
"By Jove!" he exclaimed to himself, aloud, as a new thought crept subtly to his brain. "I can hollow the log with fire!"
He went at once to the straight and ample tree-trunk, lying propped upon a rock. Its ends had already been partially consumed, and thereby rounded, in the flames that had ravaged the place. How he could cover such parts as he must not burn with a plaster of his clay, Grenville instantly conceived. And there was the log already lifted away from the earth, for the fire to be kindled beneath!
The wisdom of starting this process at once, even before his tools were made, was immediately apparent. Back to his clay heap he hastened eagerly, and, pawing it over to form a hollow pyramid, he poured in the water to soak through the mass, and so make it soft enough to use.
A new, unsparing spasm of labor seized the man in that hour, and he worked unremittingly. He felt he had loafed away his time which important requirements demanded.
The task of digging the clay from the pit and fetching it up to his hollow tree in the basket, made of creepers, was interminable. The sticks and wooden "spades" he had managed to fashion, not only broke from over-use and straining, but they were dull and heavy and awkward. The basket was scarcely more convenient than the implements in fulfilling its simple function. He could manage to carry its weight upon his head, but at this he had meager skill.
For three days he worked to get the clay, or to work it up and apply it with his hands. A considerable portion of the fallen log was thus quite promptly covered. He had then to wait for the clay to dry before his fire could be ignited.