514 Dr. A. L. Thomson : Besults of a Shul!/ of [Ibis, 



BLUE TITMOUSE {Parus cxrule^is lann.). 



A total of 653 birds was marked, of which 70, or 

 10'7 per cent., reappeared. All the birds were recovered 

 at the places of marking, and in nearly every case owing 

 to the trapping activities of the markers. The figures 

 for the species indeed illustrate exceedingly well the point 

 already brought out in the case of the Hedge-Sparrow 

 (c/. Section IX.). Of 41 caught and marked in winter 

 at Old Aberdeen, 37, or 90" 2 per cent., wer^ recovered; 

 of 15 caught and marked in winter at East Warriston, 

 Edinburgh, 8, or 53'3 per cent., were recovered; of 43 

 caught and marked in winter at Beaulieu, Hampsliire, 19, 

 or 44*2 per cent., were recovered ; while of 554 marked 

 otherwise than under these conditions — mainly in summer — ■ 

 6, or only 1*1 per cent., reappeared. 



In all, GG birds marked in winter reappeared in winter, 

 in some cases as late as the third year, and three marked 

 as nestlings and one caught and marked in summer also 

 reappeared in winter. Individual birds Avere frequently 

 recovered many times, in one instance on eleven separate 

 occasions. All the records refer to Great Britain. 



MISTLE-THEUSH (Turdus viscivorns Linn.). 

 One (Case 619) marked near York as a nestling was 

 recovered in the same district in December of the same 

 year. 



BLACKBIRD {Turdus merula Linn.). 

 During the course of the inquiry 2,641 Blackbirds were 

 marked and 68 were recovered, making 2'6 per cent. The 

 only instance of migratory movement is Case 278, which was 

 marked as a nestling in Aberdeenshire on 12.6.11 and found 

 dead near Gateshead, Co. Durham, on 7.11.11. All the 

 other records refer to birds recovered at or near the places of 

 marking, including a few from distances up to about thirty 

 miles. Of birds marked in Great Britain as nestlings, 

 thirty-one were thus recovered, thirteen of them during the 



