388 A VISIT TO THE BLACK-HEADED GULLS IN ESSEX (1898). By PERCY CLARK, BA. [Read, December 17th, 1898.] THE great inundation by the sea which took place on the Essex coast last winter has not only sadly interfered with the feed of the cattle on the parts that were submerged, but has also apparently deprived a large portion of the bird world of the like means of subsistence. In the following remarks I will confine myself entirely to the curious case of the Black-headed Gulls (Larus ridibundus). In former days Essex was the great breeding place of these birds. This we know not only from written records, but from the number of the marshy islands along its borders which are called after the Black-headed Gulls' local name of Putt, now misleadingly spelt Pewit in most county maps. The enormous stretches of marshes, swamps and saltings which once abounded near the coast and estuaries of the province were infested with every sort of water-loving bird, although the Black-headed Gulls were probably from time immemorial the most numerous. This is shown by the frequency with which the local name of Cob is still attached to various places (cf., Mr. Miller Christy's valuable work, The Birds of Essex, E.F.C. Special Memoirs, vol. ii., p. 267). But the wholesale draining of the flats in later times has caused many species entirely to desert their former breeding grounds, and at the present day of sea-birds, the black-headed gulls alone remain to nest there in any numbers. These gulls, so well known in all the reaches of the Thames, from its mouth to Kew Gardens: the hungry visitors who in winter fly in hundreds along the Victoria and other embankments asking to be fed: the daring invaders of the sacred wild fowl enclosures on the lakes of our London parks; these, within the last few years, have become regular frequenters of the Metropolis, and added, by their presence and confiding demeanour, consider- able charm to the bird life which there is only too rare. They have made themselves quite at home on the lake in St. James's Park, where they come in flocks to pick up the scraps left by the