As in previous years, the main line of migration has been a broad stream from E. to W. or from S.E. to N.W. this year, covering the whole of our east coast in comparatively equal proportions; the occurrences of migrants coming from northerly directions, or from points anything north of east, are few and far between, and in these cases are consequent on birds striking the coast in more northern latitudes and following it to the south. Thus, north of Flamborough, Larks pass up the coast from north to south; at Spurn and south of Spurn they come in directly from the sea. The closeness with which both migrants and immigrants follow the coast line has also been verified in a remarkable degree,--an observer taking up his position at a short distance from the coast would see or know nothing of migration, yet within half-a-mile or less there might be a constant stream of birds, hour by hour and day by day passing to the south. In the spring birds also return on the same lines they travelled in the autumn, from W. and N.W. to E. and S.E. A reference to the spring notes in the report on each separate species observed will show this. Our spring immigrants also arrive from the sea, and are first seen on or near the coast, gradually moving inland. Migration has been earlier than in 1880, in many cases birds arriving considerably in advance of recent years; this has been notably the case with some of the _Limicolæ_, such as have the widest ranges and where nesting grounds are circumpolar--that is, confined to lands surrounding the North Pole. Also in the case of the _Anatidæ_, which arrived fully a month before their average period. It may be said the general features of migration, having reference to lines of flight, time, height of travelling, favourable winds or otherwise, circumstances of greatest casualties at lanterns of lighthouses and light-vessels, are the same as set forth in previous reports; yet in 1881 we find several important variations from the normal phenomenon, consequent on the directions of the wind and general character of the season. From the commencement of August to the end of October the prevailing winds have been from northerly and easterly directions, blowing more or less directly on to the coast, and therefore, as also shown in previous reports, unfavourable passage winds--for it may be laid down as an axiom that, with southerly or westerly winds, not amounting to gales, normal migration is the rule, but with winds in the opposite direction, the results are very opposite; such winds, more especially if strong, weary out the immigrants and compel them to drop on the first coast they make, often completely exhausted by the passage. The consequence has been that, on our east coast, with the prevailing winds, it has been a most favourable season for the observer; and generally the number of birds recorded is considerably in excess of any previous records.