summer, where I have seen it in swarms, drifting round and round the highest peaks of its island haunt on apparently never-tiring-wing. At the summit of the cliffs its powers of flight may often be witnessed to perfection. At St. Kilda, I have watched it gracefully poising itself in the air, its narrow wings beating rapidly, and its two orange-coloured legs spread out behind acting as a rudder. Of all the Auk tribe, so far as my experience goes, the Puffin flies the most. The Puffin feeds principally upon small fish, especially sprats and the fry of larger fishes; it also eats crustaceans, and various marine insects. It dives often to a great depth, and is remarkably active beneath the surface; when on the water it generally tries to escape from danger by diving. Sometimes the Puffin may be seen close ashore during winter, but never in any abundance. The Puffin becomes by far the most interesting at its breeding places. The regularity of its appearance at these has often been remarked. In many localities it not only arrives punctually on a certain day, but retires from them in autumn with its young almost as regularly! In some places Puffins arrive on the land to breed as early as March; in others, not before April; in others, yet again, not before the beginning of May. With the exception of the south and east coasts of England—where it is only sparingly and locally distributed—the Puffin, from Flamborough northwards, is widely and generally dispersed. In some places its numbers are almost incredible, as for instance, at Lundy Island, the Farne Islands, on some of the Hebrides, and St. Kilda. There is a very interesting colony of Puffins established amongst the walls of the ancient fortress on the Bass Rock, but so far as my experience goes the colony on St. Kilda stands unrivalled, and, at a very moderate computation, must consist of many millions of birds! The Puffin most probably pairs for life, and returns time out of mind to certain familiar spots to rear its offspring. In most places the bird makes its scanty nest in a burrow which it excavates itself, but in some localities rabbit holes are frequently made use of. In some localities, however, the bird makes a nest in a crevice of the cliffs or beneath heaps of rocks. By the end of April both birds are engaged in scraping out this burrow, if circumstances demand it, which often extends for several yards in the loamy soil, sometimes sloping downwards, sometimes tortuous, sometimes nearly straight. At the end, or elsewhere in some cases, the slight nest of dry grass and a few feathers is formed. Occasionally several pairs occupy one burrow, each pair enlarging a portion of it for their own requirements into a kind of chamber; whilst many of the burrows have several openings, and are evidently the work of successive years. In this rude nest the hen Puffin lays a single egg, dull white, sometimes tinged with blue or gray, and obscurely spotted with pale brown and gray.