513 
1921 .] Bird-Migration by the Marking Method. 
Although all the birds marked in winter were, with one 
exception, recorded again only from October to March, this 
may well be attributed to the netting activities of the marker 
at that time of year. Two birds caught and marked in 
Aberdeenshire in winter were recovered in the following 
winter, and one marked early in March reappeared six weeks 
later. 
HOUSE-SPARROW (Passer domesticus Linn.). 
Seventy-one marked birds of this species were recovered, 
all of them at the places where they were marked, which 
were for the most part in Scotland although several records 
refer to Hampshire. Most of the birds were caught and 
marked in winter and recovered in the same season of the 
year, but there is a good proportion of records of birds 
marked in winter and recovered in summer and vice versa. 
The longest interval was three and a half years. The records 
tend to bear out the supposition that the species is practi¬ 
cally sedentary despite its occasional appearance at light- 
stations. 
GREAT TITMOUSE (Parus major Linn.). 
All the reappearances of marked birds of this species refer 
to the places of marking, usually to the identical gardens. 
One bird marked as a nestling in Aberdeenshire was re¬ 
covered in the following winter ; two birds marked in Bute 
in spring were recovered in their first and fourth winters 
respectively. 
Twenty-eight birds caught and marked in Scotland (two 
localities in Aberdeenshire and one in Mid-Lothian) in winter, 
w r ere recovered as follows :—sixteen during the same winter, 
one in the first summer, five in the second winter, one in the 
second winter and second summer, one in the second summer, 
two in the second and third winters, and two in the third 
winter only. One bird caught and marked in Hampshire 
was recovered five times during the following winter. The 
preponderance of winter reappearances is doubtless largely 
due to the netting activities of the markers at that season, 
most of the records coming from that source. 
