I was early afoot next morning; and as soon as I had a bite to eat, set forth upon a tour of exploration. Something in my heart distinctly told me that I should find the ship of the Armada; and although I did not give way entirely to such hopeful thoughts, I was still very light in spirits and walked upon air. Aros is a very rough islet, its surface strewn with great rocks and shaggy with fernland heather; and my way lay almost north and south across the highest knoll; and though the whole distance was inside of two miles it took more time and exertion than four upon a level road. Upon the summit, I paused. Although not very high—not three hundred feet, as I think—it yet outtops all the neighbouring lowlands of the Ross, and commands a great view of sea and islands. The sun, which had been up some time, was already hot upon my neck; the air was listless and thundery, although purely clear; away over the north-west, where the isles lie thickliest congregated, some half-a-dozen small and ragged clouds hung together in a covey; and the head of Ben Kyaw wore, not merely a few streamers, but a solid hood of vapour. There was a threat in the weather. The sea, it is true, was smooth like glass: even the Roost was but a seam on that wide mirror, and the Merry Men no more than caps of foam; but to my eye and ear, so long familiar with these places, the sea also seemed to lie uneasily; a sound of it, like a long sigh, mounted to me where I stood; and, quiet as it was, the Roost itself appeared to be revolving mischief. For I ought to say that all we dwellers in these parts attributed, if not prescience, at least a quality of warning, to that strange and dangerous creature of the tides. I hurried on, then, with the greater speed, and had soon descended the slope of Aros to the part that we call Sandag Bay. It is a pretty large piece of water compared with the size of the isle; well sheltered from all but the prevailing wind; sandy and shoal and bounded by low sand-hills to the west, but to the eastward lying several fathoms deep along a ledge of rocks. It is upon that side that, at a certain time each flood, the current mentioned by my uncle sets so strong into the bay; a little later, when the Roost begins to work higher, an undertow runs still more strongly in the reverse direction; and it is the action of this last, as I suppose, that has scoured that part so deep. Nothing is to be seen out of Sandag Bay, but one small segment of the horizon and, in heavy weather, the breakers flying high over a deep sea reef.