1 92 1.] Bird-Migration hij the Markimj Method. 



407 



The age analysis shows that all the records refer to the 

 first year of the birds' lives with the exception of two in 

 the second year (Co. Durham and Yorkshire) and one 

 in the fourth year (Moray Firth). The annual analysis 

 merely reflects the numbers marked in the different 

 seasons. 



There is a noteworthy absence of any winter records from 

 the district of mai-kinor, althouoh the conditions there are 

 favourable and the species gives a good percentage of re- 

 appearances. A southward wandering, mainly along the 

 east coast of Great Britain, is clearly indicated, and one bird 

 is shown to have crossed the North Sea to Heligoland as 

 early as 9th September in its first autumn. 



The records contrast markedly with those for the Lapwing 

 and the Woodcock in revealing no gap between the native 

 district and a comparatively distnnt winter area. This may 

 be taken as an expression of a different type of migration, a 

 gradual dispersal with a southerly trend rather than a 

 definite and rapid cliange of area. 



TABLE XIII. 



List op Reappearances of Herring-Gulls caught on the 

 shore at night, marked and released, near aberdeen, in 

 September and October 1910. 



