[Footnote 19: Under date Oct. 6th, N.E., clear, fresh, Mr. Gätke remarks:--"Across the sea both sides of island (N. and S.), particularly on north side, countless numbers of _cornix_, _sturnus_, and all kinds of small birds, all from E. to W. This occurrence happens not rarely; during this ponderous migration there were on the island nearly no birds."] _Corvus frugilegus_, Rook.--Spring, Newarp L.V., during March and April, many flocks of Rooks and Crows are recorded as going both to the west and east, as if a cross migration was going on to and from the Continent. At the Cockle L.V., March 20th, 24th, and 26th, continuous Rooks and Crows to _west_. Llyn Wells, April 30th, various flocks of Crows to _south-west_, and at the same station, on Aug. 3rd and 4th, large flocks to _north north-east_. Autumn, with scarcely an exception, at all stations between the Spurn and South Foreland, from the last week in September to the end of the third week in November; the rushes correspond with those of the preceding. _Alauda arvensis_, Sky Lark.--As in previous years. Larks hare crossed in immense numbers to the east coast; it would be quite unnecessary to give each occurrence in detail, almost involving the necessity of writing a separate report. They are recorded at all stations from the Farn Islands to Gull L.V., off the South Foreland, from Sept. 1st to Jan. 3rd, 1884, and often continuously night and day; rushes took place on Sept. 3rd, 4th, and 21st, Oct. 6th and 8th, 10th to 14th, 27th to Nov. 2nd-14th; and Dec. 27th and 30th; and again Jan. 3rd, 1884. Flocks which come in at daybreak will continue to arrive till 12 or 1 p.m., when migration for the time ceases. Numbers are killed during the night migration against the lanterns of the lighthouses and light-vessels.[20] Heligoland, Oct. 5th to Nov. 8th; great rushes, Oct. 12th; 27th, night from 11 p.m., "milliards" with Starlings; 28th, "immense flight"; 30th and 31st, in all four nights almost continuous flights.