When the snow begins to melt, these Gulls return, and in fine seasons arrive at their more northern terminus towards the end of March, or at the beginning of April. Before commencing their journey, the old birds have already selected their mates; they accompany their partners at once to the breeding-places, but the younger ones seem to defer their courtship till they arrive at their destination. They only live in the sea during the winter, and it is seldom that they breed even on islands near the coast. Fresh waters, surrounded by fields, are their favourite places of resort in the summer season, and here they find everything that they require. These birds are abundant at the mouth of the Thames, where they lay their eggs on the low flat islands and marshes of Essex. In Norfolk an extensive piece of water, called Scoulton Mere, has from time immemorial been one of their favourite breeding-places. The eggs, which are most abundant there about May, are assiduously collected, and are sometimes so plentiful that we are told a man and three boys have obtained 1,600 in a single day. When swimming, these Gulls may be regarded as ornamental birds, more especially when they are in their full plumage. Their movements are extremely elegant and graceful, they walk quickly, and are not readily tired, and for hours together may be seen following the ploughman, or roaming about fields and meadows in search of insects. They swim beautifully, but not very rapidly. They rise readily into the air, either from the surface of the ground or from the water, and apparently without effort perform a variety of pleasing evolutions during their flight. In some of the Swiss cantons, and in all parts of Southern Europe lying near the sea, they are treated by the inhabitants as if half domesticated. They may be seen everywhere, running about with the greatest confidence, as if they knew very well that no one would attempt to do them an injury. Their voice is harsh and disagreeable, earning for them doubtless the name of Sea Crows, whereby they are generally designated. Towards the end of April the breeding season commences, and after much quarrelling the place selected where each pair is to build its nest. These birds never breed separately, seldom in small parties, but most generally in large flocks, of hundreds or rather thousands of birds, which generally crowd themselves together into a very limited space. Their nests are usually placed upon insulated patches of ground surrounded by water, or situated in the centre of a marsh, and overgrown with sedges, reeds, and rushes; under some circumstances they will build in the marsh itself, sheltering their nests among tufts of grass, but always in some unfrequented situation, to which access is nearly impracticable. The foundation of the nest is laid by flattening down the herbage and lining the cavity so formed with leaves, straw, and similar materials. The eggs, which are