In crossing the narrow strait which separates the Noss from Bressay, I observed on the Bressay side, overlooking the water, a round hillock, of very regular shape, in which the green turf was intermixed with stones. "That," said the ferryman, "is what we call a Pictish castle. I mind when it was opened; it was full of rooms, so that ye could go over every part of it." I climbed the hillock, and found, by inspecting several openings, which had been made by the peasantry to take away the stones, that below the turf it was a regular work of Pictish masonry, but the spiral galleries, which these openings revealed, had been completely choked up, in taking away the materials of which they were built. Although plenty of stone may be found everywhere in the islands, there seems to be a disposition to plunder these remarkable remains, for the sake of building cottages, or making those inclosures for their cabbages, which the islanders call _crubs_. They have been pulling down the Pictish castle, on the little island in the fresh-water loch called Cleikimin, near Lerwick, described with such minuteness by Scott in his journal, till very few traces of its original construction are left. If the inclosing of lands for pasturage and cultivation proceeds as it has begun, these curious monuments of a race which has long perished, will disappear. Now that we were out of hearing of the cries of the sea-birds, we were regaled with more agreeable sounds. We had set out, as we climbed the island of Bressay, amid a perfect chorus of larks, answering each other in the sky, and sometimes, apparently, from the clouds; and now we heard them again overhead, pouring out their sweet notes so fast and so ceaselessly, that it seemed as if the little creatures imagined they had more to utter, than they had time to utter it in. In no part of the British Islands have I seen the larks so numerous or so merry, as in the Shetlands.