Then the Dutchman stopped for a while to gaze at the butt of the mainmast. Nowhere was it more obvious than from this standpoint that what they were really looking at, here, was a stupendous tree-trunk, most likely from a virgin forest in America. In other places its nature was somewhat concealed by the carpenters’ work, and by bands of iron that had been hammered out in some enormous forge somewhere and, while still red-hot, slipped onto it like rings onto a finger so that as they cooled and shrank they would cut into the wood and become one with it. But here at the foot of the mainmast—which was almost as thick as van Hoek was tall—the tree’s growth rings, and the boundary between heartwood and sapwood, were obvious even through diverse layers of tar, caulk, and paint. Van Hoek had gazed upon it twice as he circled round the mast, and seen nothing untoward, But on this third circuit he came in closer and began to hammer at the wood with the pistol-butt. Jack heard a solid thunk, thunk and then a sharp whack; a moment’s silence; and then a cry from the Dutchman.