are the first portions in which the black appears; yet almost at the same time this colour is seen in the form of minute specks on the lower third of the feathers, quickly spreading into crescentic markings, and ultimately covering the entire surface. Half a dozen species are British. Of these, four breed more or less abundantly in our area, and the other two are irregular winter visitors. The now extinct Great Auk—the largest known representative of the family—formerly bred in certain parts of the British Islands, but, alas, is now only known as a fast receding tradition. We will now proceed to a short study of these British Auks. GUILLEMOT. Of all the various sea birds that cluster on the cliffs of Albion this species, the _Uria troile_ of most modern ornithologists, is by far the commonest, and of the present family of birds the most widely distributed. During summer it may be met with in colonies of varying numbers, here and there on most of our rocky coasts, from the Scilly Islands to the Shetlands, from Flamborough Head in the east to the Blaskets in the west. Not, perhaps, so familiar to the sea-side wanderer as the Gull, whose ærial habits bring it more frequently into notice, the Guillemot, nevertheless, is a seldom absent feature of marine bird life. It is gregarious and social at all times, but joins into greatest companies during the season of reproduction. When the nesting season has passed the birds spread themselves more generally along the coast and out at sea, and it is at such times that they are most ubiquitous. Between October and March the Guillemot may often be met with swimming close in shore, in quiet bays, and especially in the neighbourhood of fishing villages. On these occasions it is not particularly shy, and will allow a sufficiently close scrutiny, but it is ever wary, diving at the least alarm, and appearing again well out of danger. The Guillemot swims well and buoyantly; it also dives with remarkable agility, and obtains most of its food whilst doing so. The Guillemots are rarely seen upon the land after the young have quitted their birthplaces; they spend their entire time upon the sea, seeking shelter during rough weather in bays or under the lee of headlands, but not unfrequently great numbers perish in a gale, their dead bodies strewing the coast where the tide has cast them ashore. Except during the breeding season the Guillemot flies very little, but during that period it often feeds far from its rocky haunts, and may then be seen, especially at eventide, flying in little bunches, or in compact flocks, swiftly and silently just above the waves, returning to them. The food of this bird is almost exclusively composed of fish, especially such small species as pilchards and sprats; it is also extremely partial to the fry of the herring and the pollack. Few birds are more expert at catching fish than the Guillemot; it dives after them, and chases them beneath the surface with