He shaded his eyes as he looked up at a great blackbird, winging its way high up above the top of the great cliff which hung over the river, and watched till it disappeared, when, in a low melodious voice, he began singing softly another snatch of an old English song, something about three ravens that sat upon a tree, with a chorus of: "Down, a-down, a-down," which he repeated again and again, as if it helped him to reflect. "Wonder where they are building this year," he said to himself again. "I should like a couple of little ones to bring up. Get them young, and they'd be as tame as tame." He went on wondering where the ravens, which frequented the neighbourhood of the river and its mountainous cliffs, built their nests; but wondering did not help him, and he gave up the riddle, and began, in his pleasant holiday idleness, to look about at other things in the unfrequented wilderness through which the river ran. To trace the raven by following it home seemed too difficult, but it was easy to follow a great bumble-bee, which went blundering by, alighting upon a block of stone, took flight again, and landed upon a slope covered with moss, entering at last a hole which went sloping down beneath the stones. A little farther on, where a hawthorn whitened the bank with its fragrant wreaths, there was a quick, fluttering rush, a glimpse of a speckle-breasted thrush, and a little examination showed the neat nest, plastered inside smoothly with clay, like a cup, to hold four beautiful blue eggs, finely-spotted at the ends. "Sitting, and nearly hatched," said the lad. "Might wait for them, and bring them up. I dunno, though. Sing best in the trees. Wouldn't hop about the courtyard and cliffs like the young ravens. Wonder where they build?" He went on, to stop and watch the trout and grayling, which kept darting away, as he approached the riverside, gleaming through the sunlit water, and hiding in the depths, or beneath some mass of rock or tree-root on the other side. "Rather stupid for me, getting to be a man, to think so much about birds' nests; but I don't know: perhaps it isn't childish. Old Rayburn is always watching for them, and picking flowers, and chipping bits of stone. Why, he has books full of pressed grasses and plants; and boxes full of bits of ore and spar, and stony shells out of the caves and mines.--Well now, isn't that strange?" He stopped short, laughing to himself, as he suddenly caught sight of a droll-looking figure, standing knee-deep in the river, busy with rod and line, gently throwing a worm-baited hook into the deep black water, under the projecting rocks at the foot of the cliff.