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 breadth twenty-two inches, length of wing six and a half inches, and of tail two inches. The range of the Black Guillemot extends from about 80° to 53° north latitude: within this zone it is met with on every sea-coast. These birds are seldom seen assembled in large numbers; they generally arrive in small parties, or in pairs. It is only when the sea is frozen over, that they congregate together around any openings that may be met with in the ice, and as soon as opportunity offers, they again disperse, and distribute themselves among their usual haunts. As the severity of winter increases, they migrate further towards the south, and it is only at such seasons that they occur upon our own shores. There is always something cheerful in the aspect of these birds, whether they are seen sitting upright on the rocks, or swimming and diving in their proper element; they float upon the water light and buoyant, and as they row themselves gracefully along, their bright red feet often become visible above the surface. When they dive, their movements are equally graceful; a single backward stroke of their feet raises their tails into the air, and instantly they disappear, without any visible disturbance of the water around them. As soon as they are fairly submerged, they partially open their wings, and by the aid of these, as well as of their feet, they shoot along with great rapidity, remaining under water about two minutes before they again show themselves. When the sea is tranquil and the water clear, their course may be easily traced for a considerable distance, but we think that some observers have over-*estimated the depth to which they are able to plunge. Their flight is tolerably good, although, owing to the shortness of their wings, they are compelled to make such rapid strokes as to produce a whirling sound. When about to fly, they rise from the sea with some little difficulty, and have to make considerable efforts in order to get the necessary impetus; but so soon as they have attained a certain elevation, they can mount rapidly to the top of the cliffs, upon which they frequently take their station. Their voice differs considerably from that of the generality of their congeners; instead of the usual scream it is rather a whistling note. About the beginning of March, they begin to assemble at their breeding-places in small flocks, seldom consisting of more than thirty or forty together, although millions of other birds may resort to the same locality; and here each pair selects a suitable rent or fissure in the rock, at a short distance from the entrance of which, towards the end of April or beginning of May, the female lays her two eggs upon the bare stone. The eggs are tolerably large, with coarse lustreless shells of a dingy whitish or blueish green colour, spotted with ashy green, and streaked with brown or blackish brown patches. Should the eggs first laid be removed, as they very frequently are when the breeding-places are accessible, the breeding pair will lay a second time, but usually only a single egg. The parents take their turns in the task of incubation, towards the close of which they sit so assiduously that they will suffer themselves to be captured rather than desert their charge. After the lapse of twenty-four days, the young make their appearance, clad in a thick covering of greyish down; at first they are diligently fed upon sand-worms, small molluscs, sand-eels, and similar fare, but they are soon able to fish for themselves; they swim well from their earliest infancy, but are not able to dive until they are fully fledged. In Greenland and Iceland, great numbers of these birds are killed and eaten, the Norwegians, however, are content to take their eggs. Their flesh has a strong flavour of train-oil, still it may be rendered eatable if properly cooked; in Lapland, the young birds are often brought to table; the feathers, also, are used to fill beds, but they are chiefly profitable on account of their eggs, which, although they have a very peculiar taste, are eagerly sought after. In the British Isles, according to Macgillivray, the Black Guillemot has no breeding-places south of the Tweed and Solway; the most southern point being the Bass Rock at the mouth of the Firth of Forth, and the Isle of Man.

The TRUE GUILLEMOTS (Uria) are larger than the above birds, but very similar in structure; their beak is elongated, of moderate length, straight and sharply-pointed, slightly vaulted above, and