Turdidæ.--In spring a considerable migration noticed at certain stations, _viz._, Pentland Skerries, Bell Rock, and Isle of May. Began Feb. 2nd, when a rush of Song Thrushes took place at Bell Rock, and terminated May 10th, when, and upon the 9th, there were indications of another rush of Fieldfares and Ring Ouzels. Whilst Song Thrushes, Redwings, and Blackbirds seem usually to travel together, the larger-winged Fieldfares and Ring Ouzels are usually associated in our returns, though not invariably. Although this spring migration was spread over such a very considerable time, none of the returns are very heavy; but indications of rushes are sufficiently distinct. At Bell Rock, as above stated, on Feb. 2nd, strong E.N.E., with haze. Fieldfares and Ring Ouzels; at Isle of May, on March 2nd, light W., clear, Thrushes and Blackbirds--a decided but not large rush, which stopped abruptly with wind changing to gales from S.E. to E.N.E. and to N.W. (see Third Report, General Remarks, p. 67.--J. A. H. B.). In April, light but fairly continuous entries at Pentland Skerries and Isle of May, but little indication of a general movement, except on April 27th, when a good many Fieldfares and Ring Ouzels were noted at Isle of May, wind fresh S.E. Prevailing winds up to termination of spring migration, easterly along whole coast. On May 2nd, and again on 9th and 10th, there were faint indications of rushes at Isle of May, principally of Fieldfares. In autumn the migration was pronounced, and confined principally to October and November. Yet the earliest record we have yet received in Scotland in our schedules occurred on Aug. 28th, at Isle of May, of two Song Thrushes, followed by a single record on Sept. 21st; also at Isle of May, "a few Redwings and Ring Ouzels." Again, passing at present over October and November, only one record in December of a solitary Fieldfare on the 5th; and in January, 1884, a flock on the 7th and three birds on the 22nd, during a wild W. gale. The month of October has many entries, and I find the word "rush" opposite the following dates and stations:--At Pentland Skerries and Isle of May, but not at Bell Rock, on 13th-15th, hundreds of Redwings and Ring Ouzels, also Blackbirds and Thrushes, besides many other birds whose names I will give later. Also at N. Unst a few stragglers rested on the 16th, and then flew south, with strong S.E. wind and haze. Again, from about Oct. 28th to Nov. 5th, a great movement, developing into vast rushes, between Oct. 30th and Nov. 3rd, on which latter day a Dipper (_Cinclus_) was seen on the Isle of May; twice fired at for the collection, but escaped. The stations, N. Unst, Sumburgh Head, Pentland Skerries, Tarbat Ness, Bell Rock, and Isle of May participated (maximum at Isle of May), but also large numbers at Pentland Skerries, Bell Rock, and goodly appearance at Sumburgh Head on Nov. 1st. On Oct. 13th-15th wind was S., but shifted to W. at Isle of May. On Oct.