Spike seemed struck with the truth of this suggestion; and he soon sent a glass aloft by the signal-halyards. Thus provided, Jack descended as low as the cross-trees, where he took his seat, and began a survey at his leisure. While thus employed, the brig was secured for the night, her decks were cleared, and the people were ordered to get their suppers, previously to setting an anchor-watch, and turning-in for the night. No one heeded the movements of Tier,--for Spike had gone into his own state-room,--with the exception of Josh and Simon. Those two worthies were still in the galley, conversing on the subject of Jack's recent communications; and ever and anon one of them would stick his head out of the door and look aloft, withdrawing it, and shaking it significantly, as soon as his observations were ended. As for Tier, he was seated quite at his ease; and having slung his glass to one of the shrouds, in a way to admit of its being turned as on a pivot, he had every opportunity for observing accurately, and at his leisure. The first thing Jack did, was to examine the channel very closely, in order to make sure that no boats were in it, after which he turned the glass with great eagerness toward the reef, in the almost hopeless office of ascertaining something concerning Mulford. In point of fact, the brig had anchored quite three leagues from the solitary rock of the deserted mate, and, favoured as he was by his elevation, Jack could hardly expect to discern so small and low an object as that rock at so great a distance. Nevertheless, the glass was much better than common. It had been a present to Spike from one who was careful in his selections of such objects, and who had accidentally been under a serious obligation to the captain. Knowing the importance of a good look, as regards the boats, Spike had brought this particular instrument, of which, in common, he was very chary, from his own state-room, and sent it aloft, in order that Jack might have every available opportunity of ascertaining his facts. It was this glass, then, which was the means of the important discoveries the little fellow, who was thus perched on the fore-topmast cross-trees of the Swash, did actually succeed in making.