it all meant. The man, with quick-repeated blows, drove the peg farther and farther down into the sand until it showed only two or three inches above the surface. As he finished his work there was another faint flash of light, and by and by another smothered rumble of thunder, and Tom, as he looked out toward the westward, saw the silver rim of the round and sharply outlined thundercloud rising slowly up into the sky and pushing the other and broken drifting clouds before it.
The two white men were now stooping over the peg, the negro man watching them. Then presently the man with the cane started straight away from the peg, carrying the end of a measuring line with him, the other end of which the man with the plaited queue held against the top of the peg. When the pirate captain had reached the end of the measuring line he marked a cross upon the sand, and then again they measured out another stretch of space.
So they measured a distance five times over, and then, from where Tom lay, he could see the man with the queue drive another peg just at the foot of a sloping rise of sand that swept up beyond into a tall white dune marked sharp and clear against the night sky behind. As soon as the man with the plaited queue had driven the second peg into the ground they began measuring again, and so, still measuring, disappeared in another direction which took them in behind the sand dune where Tom no longer could see what they were doing.
The negro still sat by the chest where the two had left him, and so bright was the moonlight that from where he lay Tom could see the glint of it twinkling in the whites of his eyeballs.
Presently from behind the hill there came, for the third time, the sharp rapping sound of the mallet driving still another peg, and then after a while the two pirates emerged from behind the sloping whiteness into the space of moonlight again.
They came direct to where the chest lay, and the white man and the black man lifting it once more, they walked away across