ter go on the forecastle
himself and conn the ship through the passage, which was a place he did
not like. Mark was vexed that the change should be made just at that
critical instant, but bounding forward, he was between the knight-heads
in half a minute, looking out for the buoys. At first, he could not see
them; and then he most felt the imprudence of Bob's quitting his post in
such a critical instant. In another minute, however, he found one; and
presently the other came in sight, fearfully close, as, it now appeared
to our young mariner, to its neighbour. The position of the ship,
nevertheless, was sufficiently to windward, leaving plenty of room to
keep off in. As soon as the ship was far enough ahead, Mark called out
to Bob to put his helm hard up. This was done, and away the Rancocus
went, 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 consequence 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 staysail, which was s