When a seabird appears inland the usual explanation given is "storm-blown," but increasing knowledge shows the frequent fallacy of this idea. The Manx shearwater, for instance, is a regular migrant, and the examination of the dates of the records of so-called "storm-blown" birds found in inland localities, shows a remarkable regularity; the majority are met with between the end of August and the end of the first week in September. Not only do the birds move south in the early days of September but many, usually at any rate, cross England; the weaklings fall out and are found. Is it possible that some of these collapses of passing birds are due to more than mere physical fatigue? Aviators have discovered the existence of "wind pockets" or "holes in the air," where the resistance of the air appears suddenly to fail; what is the effect on a flying bird which suddenly enters one of these pockets? The lesser black-backed gull also crosses England in large numbers; its movements are more noticeable than those of the herring gull, common gull, or even of the inland nesting and inland feeding black-headed gull. Recent investigation has added the yellow-browed warbler, the blue-throat, and many other "rare," or "casual" passerine birds to the list of regular British birds of passage; evidently they have been overlooked before. Even the crossbill, so long classed as a spasmodic invader, is now seen to be a regular bird of passage to Britain, though in varying numbers, and quite independently of the sub-specific form which is always with us. The wanderings to our islands of southern petrels and other oceanic birds has occasioned much surprise. Take two examples of the genus _Oestrelata_, one _O. brevipes_ taken at Borth in 1889, and _O. neglecta_ in Cheshire in 1908, the known breeding range of both being in the western Pacific; pelagic wanderings might lead a bird anywhere, but it is conceivable that investigation may show that the breeding area is wider than is supposed and that these species have stations even in the South Atlantic.