and young gar-fish forming the principal supply, upov which it precipitates itself as they rise near to the surface of the ocean. Its flight is strong and rapid, making a great advance at each stroke of the pinions ; and, except when engaged in incubation, it is almost constantly on the wing, uttering at intervals a hoarse and grating cry, which can be heard at a very great distance, and gives notice of its approach long before it is discoverable to the eye. If much disturbed by being fired at, or if the eggs be repeatedly taken at the commencement of the season, it deserts the station first selected and retires to some other place less liable to molestation. . . . As soon as the young birds become tolerably fledged, but before they are altogether able to fly, they frequently take to the water, swimming off to the smaller rocks, where they continue to be fed by the parents until they are capable of joining them in their fishing-excursions. The time of their arrival is about the middle of May; incubation commences the first week in June; and nearly the whole have taken their departure for more southern latitudes by the end of September. The eggs are three or four in number, for the reception of which a shallow hole is scratched amongst the sea- campion (Si/ene maritima) or other plants that may happen to grow on the selected place. In size they are about equal to those of the Golden Plover, and are usually of a cream or wood-brown colour, blotched with dark brown and black, and with other spots of a lighter shade, appearing as if they were beneath the shell. The common varieties of them are either with fewer spots and blotches upon a white ground, or of a deep oil-green, with spots of a darker shade.” Mr. Harting, in his notes on ‘ The Birds of Watney Island’ (situate on the north-west coast of Lancashire, to the west of Low Furness, and which is about nine miles long by a mile broad at its greatest breadth), says :—‘ Long before we reached the eyry of the Sandwich Terns we could point to the exact situation of the nests; for the birds were continually hovering above and around them. As we approached they rose perpendicularly to a.great height, keeping up a succession of harsh screams, not unlike the sound produced by running a sharp stick across a comb. The nests were composed entirely of grass, and placed quite close to each other on the ground, on the side of a sand-hill, among long thin grass. Standing still for a few minutes, I counted seventeen nests, all close to each other, and all containing eggs, the majority having three.” I may add a few words respecting the other countries in which this bird has been observed. Nilsson says it is seen occasionally in the southern parts of Sweden, and is included among the birds of Germany. Temminck states it to be abundant in North Holland. It frequents the coast of France, and is said to breed on some small islets of Ushant; it visits some of the lakes of Switzerland, has been seen at Genoa and in Italy, and is well known in Portugal. Mr. Howard Saunders says it is *‘ tolerably abundant on the coast of Southern Spain, breeding at the mouth of the Ebro and along the shores of Mar Menor, near Cartagena.” Mr. Simpson noted it in the Dobrudscha. Lord Lilford states that it occasionally occurs at Butrinto, in the Jonian Islands. Mr. Salvin shot one flying over the Lagoon of El Baheira, and saw others in the Eastern Atlas. It was seen near Damietta by Mr. E. C. Taylor, and on the coast of Tangier and Morocco in winter by Mr. C. F. Tyrwhitt Drake. Mr. Wright says a few are sometimes seen in autumn and winter at Malta. Messrs. Elwes and Buckley note that it is common on the Black Sea in sammer, and breeds near Kustendji. And, lastly, Mr. Gurney includes it among the birds of South Africa. The Plate represents a male and a female in full summer dress, of the natural size. The plant is the sea-pea (Pisum maritimum).