It is useless to add that notwithstanding the wide extent of sea which the explorers could survey, and though the engineer swept the horizon with his glass, no vessel could be found.
The shore was of course examined with the same care from the edge of the water to the cliff, and nothing could be discovered even with the aid of the instrument.
"Well," said Gideon Spilett, "it seems we must make up our minds to console ourselves with thinking that no one will come to dispute with us the possession of Lincoln Island!"
"But the bullet," cried Herbert. "That was not imaginary, I suppose!"
"Hang it, no!" exclaimed Pencroft, thinking of his absent tooth.
"Then what conclusion may be drawn?" asked the reporter.
"This," replied the engineer, "that three months or more ago, a vessel, either voluntarily or not, came here."
"What! then you admit, Cyrus, that she was swallowed up without leaving any trace?" cried the reporter.
"No, my dear Spilett, but you see that if it is certain that a human being set foot on the island, it appears no less certain that he has now left it."
"Then, if I understand you right, captain," said Herbert, "the vessel has left again?"