506 Dr. A. L. Thomson : Results of a Study of [Ibis, 
The four cases of birds recovered in Norway, three of 
them from the part of that country lying near the Arctic 
Circle, serve to indicate the summer quarters of at least 
some of the birds which reach the British Isles in winter. 
Finally there are the following reappearance records of 
Starlings which were marked on migration at British light¬ 
houses :— 
Case 458: Marked at night at the lighthouse, Isle of May, Firth of 
Forth, on 12.10.13 ; 
killed near Omerbane, Co. Antrim, Ireland, on 29.1.14. 
Case 456: Marked at night at St. Catherine’s Lighthouse, Isle of Wight, 
on 23.11.13; 
killed at St. Andrew’s, Guernsey, on 6.1.14. 
Case 822 : Marked at night at St. Catherine’s Lighthouse, Isle of Wight, 
on 13.3.15; 
caught near Walsall, Staffordshire, on 25.12.16. 
Case 452: Marked at night at the Skerries Lighthouse, off Anglesey, 
North Wales, on 23.10.12; 
caught at Svendborg, Denmark, about 10.5.14. 
Of these records, Case 452 was obviously a winter visitor 
and Case 458 not improbably the same ; the other two may 
have been native birds, but in view of the conclusions 
already suggested it is of interest that in all the instances of 
this kind there is at least a possibility that the subjects were 
winter immigrants. 
Witherby (26) has a number of records not yet published 
in collected form, and the species hais also been largely 
studied by Mortensen (9, 11, 12). 
VIII.—THE SONG-THRUSH (Turdus musicus Linn.): 
ANALYSIS OF RECORDS. 
The very complex movements of this species have been 
fully worked out by other methods [of. Eagle Clarke, 
Beport Brit. Assoc., 1900, p. 404 ; also B. O. C. Migration 
Reports), and it is known that different individuals may be 
respectively residents, summer visitors, winter visitors, or 
birds of passage. Most of the records here available refer 
