72 THE CRATER; Mark watching her with the utmost vigilance, lest she should sheer a little too much to the one side or to the other. He hardly breathed as the vessel glided down upon these two black sentinels, and, for an instant, he fancied the wind or the current had interfered with their positions. It was now too late, however, to attempt any change, and Mark saw the ship surging onward on the swells of the ocean, which made their way thus far within the reefs, with a greater intensity of anxiety than he had ever before experienced in his life. Away went the ship, and each time she settled in the water, our young man expected to hear her keel grating on the bottom, but it did not touch. Presently the buoys were on her quarters, and then Mark knew that the danger of this one spot was passed ! The next step was to find the southern end of the outer ledge that formed the succeeding passage. This was not done until the ship was close aboard of it. A change had come over the spot within the last few hours, in conse quence of the increase of wind, the water breaking all along the ledge, instead of on its end only; but Mark cared not for this, once certain he had found that end. He was now half-way between his former anchorage and the crater, and he could distinguish the latter quite plainly. But sail was necessary to carry the ship safely through the channel ahead, and Mark called to Bob to lash the helm a-midships after luffing up to his course, and to spring to the main-topmast staysail halliards, and help him hoist the sail. This was soon done, and the new sail was got up, and the sheet hauled aft. Next followed the mizen stay sail, which was spread in the same manner. Bob then flew to the wheel, and Mark to his knight-heads again. Contrary to Mark s apprehensions, he saw that the ship was luffing up close to the weather ledge, leaving little danger of her going on to it. As soon as met by the helm, however, she fell off, and Mark no longer had any doubt of weathering the northern end of the inner ledge of this passage. The wind coming in fresher puffs, this was soon done, when the ship was kept dead away for the crater. There was the northern end of the reef, which formed the inner basin of all, to double, when that which remained to do was merely to range far enough within the reef to get
