A year or two ago I had occasion to catch an early train in Westmorland, and whilst walking through some rock-strewn pastures to the station came to an old wooden bridge crossing the river Eden. It was close upon Christmas, the air was biting cold, and everything clad in the crystal purity of a heavy hoar frost. Just as I approached the river, day was breaking, and my attention was arrested by a sweet, silvery snatch of song, which I at once recognised as that of the Dipper. I waited on the footbridge until it was light enough to see the bird standing on a moss-clad boulder in the middle of a dark, glassy pool, and shall never forget the beauty of the morning light breaking on the water, the stillness of the scene amidst the lonely hills, nor the sweetness of that exquisite little carol sent out like a flood of joy on the crisp, winter air. [Illustration: DIPPER AND NEST.] The call note of the species is _zit_ or _chit, chit_, uttered both when the bird is on the wing and whilst curtseying and dipping in its own quaint way on some stone half submerged in a brawling stream. The bird builds its nest in all kinds of positions, but never away from flowing water. It may be found in crevices of rock, in holes beneath stone bridges, on large moss-grown boulders in or on the bank of a stream, behind the falling waters of a cascade, and in trees overhanging rivers. It is quite a large structure for the size of the builder, and is made of moss securely woven and felted together on the outside and lined with rootlets, soft dead grass, and leaves placed layer upon layer inside. It is dome-shaped, with the entrance hole placed so low down that the overhanging roof forms a kind of portico which cunningly prevents any stray splash of water from finding its way inside. The eggs, numbering from four to six, are pure white, and quite unspotted. Young Dippers, instead of having white, conspicuous breasts like their parents, have the feathers edged with dusky black, which greatly aids concealment when they are sitting at rest. This species breeds in the North and West of England, Wales, Scotland, and Ireland wherever there are tumbling, foaming brooks suitable to its habits. A spring or two ago I spent several days inside a hollow, artificial rock, photographing the bird represented in our illustration, and was delighted with its interesting ways. The cock fed the hen, sitting inside the nest keeping their tiny chicks warm during some particularly cold weather for the season, and performed his task with great diligence and dispatch.