514 Dr. A. L. Thomson : Results of a Study of [Ibis, 
BLUE TITMOUSE (Parus cxruleus Linn.). 
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 
( cf. Section IX.). Of 41 caught and marked in winter 
at Old Aberdeen, 37, or 90'2 per cent., were 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, Hampshire, 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, 66 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 were frequently 
recovered many times, in one instance on eleven separate 
occasions. All the records refer to Great Britain. 
MISTLE-THRUSH (Turdus viscivorus 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 
