moreover, this is a toil which recurs to them regularly every year." The nest itself is made at the end of the above-mentioned passage, and consists of a bed of straw, hay, and fibres, snugly lined with wool, hair, and feathers. The eggs, five or six in number, are of an oval shape, and have a thin, pure white shell. The young are hatched in a fortnight, and remain for a similar period under the care of their parents. Should the first family not be reared, a second brood is at once laid. The flight of the Sand Martin is so light as to bear comparison with that of the butterfly. Its voice is weak and gentle, and its disposition lively and active; it is extremely social, and lives at peace with most other birds. In its general habits it resembles its congeners, but leaves for warmer climes earlier in the year than they do, and does not reappear till about May. THE ARIEL SWALLOW. [Illustration: THE ARIEL (_Chelidon Ariel_).] The ARIEL SWALLOW, or FAIRY MARTIN (_Chelidon Ariel_), as the Australian representative of our Roof Swallow is called, is about three inches and a half in length. The upper part of its body is deep blue, the top of the head rust-red, the rump brownish white, and the tail dark brown; the eye is blackish brown, the beak black, and the foot brownish grey. According to Gould, the Ariel appears in the southern and western portions of Australia about August, and, seeking after its old haunts, lays two or three broods, and departs again in February. In some situations the nests of this species are built crowded together under eaves of houses and hollow trees, or beneath the shelter of an overhanging rock; the male birds assist in the construction of the long flask-like passage by which the actual home for the young is entered, and fetch clay for the females while employed in building.