The autumn migration of 1883 was pronounced, and confined principally to end of October and November, of _Turdidæ_, _Cinclidæ_ (one of which, seen at Isle of May, was afterwards described to me as having no brown between the black and white of the breast); also of Snow Buntings, Sky Larks, Robins (small numbers), Linnets, Chaffinches, Starlings, culminating in a grand rush past of the bulk between Oct. 28th or 30th and Nov. 3rd. The heaviest rush, observed at the time of a south wind, as compared with other years, at Isle of May, was on Oct. 13th and 14th, a S.E. wind, according to Mr. Agnew, being usually more favourable at that point. This October to November rush is undoubtedly the principal feature of our returns over the whole country. Of the expansion of the fan or wave our returns from both E. and W. coasts give a very fair indication. It seems likely that, although most land-stations have not returned very heavily-laden schedules,--not to compare, for instance, with 1882,--yet, as noticed by Mr. Cordeaux, quite as many, if not more, birds were observed at the light-ships; that the reason for this may be found in the normal and favourable direction of the winds prevailing in the North Sea at the time of autumn migration, resulting in greater numbers of birds passing inland without resting, and being thus less liable to come under observation, except at specially suitable stations. And, if we / compare the schedules of 1883 and those of 1882 on the West Coast of Scotland we find that, while larger numbers are recorded at the more northerly stations in 1883 than in 1882, there is a lighter return at more southerly stations in the autumn of 1883 than there was in the autumn of 1882. Thus to no inconsiderable degree the order of the statistics of two years is reversed. It would almost appear in this way that when a "spread fan" reaches our E. coast with S.E. winds--reaching, as it did in 1882, from Faroe S. to the English Channel--the birds, being tired and worn out, promptly seek shelter, and then, when rested, pursue their migration on more southerly lines, and do not reach so far west, except such as fail to catch up the land, and are driven forward helplessly. This would cause comparative desertion of the more northerly stations of the W. coast and Outer Hebrides, as in 1882. But on the other hand, when a "closed fan" reaches our E. coast with prevailing westerly and north-westerly winds, and, having much less expansion to the northward, as in 1883, as regards the E. coast, it seems that birds arriving, less exhausted with the winds best suited for their successful passage, pass on inland, the same lines of flight being persevered in, and thus reach further north upon the West Coast of Scotland.