1 92 1.] Bird-Migration hy the Marking Metliod. 513 



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-SPAEEOW (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 wint^' 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. 



GEEAT 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, 

 were 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 sunnner, 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. 



