As Wat sailed farther to the west he could hear the surf hammering in the caves which look towards the Atlantic—a low, continuous growl of sound, mostly reverberating like the distant roaring of many wild beasts, but occasionally exploding with a louder boom as a full-bodied green roller from mid-ocean fairly caught the mouth of a cave, for a moment gagged and compressed the imprisoned air within it, and then sent it shooting upward through some creux or gigantic blow-hole in a burst of foam and white water which rose high into the air. The wonder and solemnity of this ceaseless artillery at the hour of evening, and with the Atlantic itself lying like a sea of glass outside, impressed the landwardborn Wat greatly. For he had never before dwelt in the midst of such sea-marvels, nor yet upon the shores of such a rock-bound, wave-warded prison as this inhospitable isle of Suliscanna.

The heavy boat slowly gathered way under the pressure of the broad oar-blade wielded by Wat's very vigorous young arms. And all went well while he kept the inner and protected side of the reef, but so soon as he had begun to clear the lofty cliffs of Suliscanna, and to bethink himself of attempting to cross the belt of turbid and angry waters interposed between the quiet inner haven and the cool, green lift of the ocean waves without, the boat stuck in the sand and heeled over, first with an oozy glide, and then with a sharper "rasp," as though the knife-edge of a basalt reef were masked beneath. Her head fell sharply away, and the waves coming over the bar in brown-churned foam threatened every moment to swamp her.

Wat felt the depth of the water with his oar, and promptly leaped overboard. His feet sank dangerously into the slushy ooze of the bank, but the boat, relieved of his weight, rose buoyantly on the swell, and Wat, clasping his hands about her prow, was dragged clear, and presently, drenched and dripping for the third time that day, he found himself aboard again.

Clearly there was nothing further to be obtained by persevering in that direction, at least with a boat so unwieldy as that in which Scarlett and he had come over from the main-land. So Wat resolved to try if he could not find a smooth and safe passage by hugging the shore of Fiara, thus avoiding the sweep of the tide-race, and in the end reaching the still, deep strait lying between the rocks of his isle and the huge, lowering cliffs of Lianacraig, which so tantalizingly shut out from his view all that he wished to see of the spot on which, as he believed, his love waited for him.

Full of this thought, Wat turned the prow of the boat and struck confidently along the shore, past the bay where he had first brought the derelict ashore, and on towards the projecting eastern ness of Suliscanna. But here there was no projecting bar, and Wat promptly found himself in the same uneasy, boiling swirl which had so disastrously ended his former voyage. Nevertheless, he persevered for some distance, for indeed he saw no other way of reaching the southern isle. But suddenly, not ten yards in front of his boat, appeared the turbulent, arched back of a yet more furious tide-race. The prow of the boat was snatched around in an instant; two or three staggering blows were dealt her on the quarter as she turned tail. The oar was almost dragged from his hand, and in another moment Wat found himself floating in the smooth water at the tail of the reef, not far from where he had started. He almost laughed, so suddenly and completely had the proof been afforded him that there was no outgate east or west for a heavy craft so undermanned as his was.

It was with a heavy heart, therefore, that Wat had perforce to give up the boat as a means of reaching the southern island. After his defeat he went ashore and sat gloomily watching the pale lilac light of the evening fade from the rocks above the narrow strait. Beneath him the waters of the deep sound were still, and only beat with a pleasant, clappering sound on the rocks. A quick and desperate resolve stirred in Wat's heart.

He stripped himself of his upper clothes, and, leaving all but his shirt and his knee-breeches among the rocks, he bound these upon his head, fastening them with his soldier's belt under his chin.

Then, without pausing a moment to give his resolution time to cool, he dropped into the water and swam straight across the narrow, rock-walled strait towards the black rampart line of the cliffs of Lianacraig.

He was well aware that he had taken his life in his hand, for from the side of the sea these grim crags had apparently never been scaled by human foot. But Wat had another idea than climbing in his mind. As he had watched the waves glide without sound or rebound into the great square arch which yawned in the midst of the rocky face, a belief had grown into certainty within him that the passage must be connected with another arm of the sea at the farther side of the cliffs. With quick, characteristic resolve he determined to discover if this supposition were correct. He found no difficulty in swimming across the narrow strait of Fiara, in spite of a curious dancing undertow which now threw him almost out of the water, and anon mischievously plucked him by the feet as if to drag him bodily down to the bottom. Presently, however, he found himself close underneath the loom of the cliffs, and the great black archway, driven squarely into their centre, yawned above him.

By this time Wat's eyes had become somewhat accustomed to the darkness, and he could make out that the line where the sea met the rocks was brilliantly phosphorescent, and that this pale green glimmer penetrated for some distance into the dark of the rock-cut passage.