1 92 1.] Bird-Migration hy the Marking MetJiod. 503 



of native birds from the winter visitors and birds of 

 passage. 



The data available as the result of this inquiry fall under 

 the following heads : — Birds marked as nestlings, birds 

 caught and marked in summer, birds caught and marked in 

 winter, and birds caught and marked on migration at light- 

 houses. The first two categories consist of obviously native 

 birds, the third of a mixture of native birds and winter 

 visitors, as will be seen, and the fourth either of a similar 

 mixture or entirely of winter visitors and birds of passage. 

 The four groups have accordingly been analysed separately, 

 the first two being afterwards discussed in conjunction. 



TABLE XVI. 



Numbers of Starlings Marked axd Kecovered. 



The percentage of birds recovered, calculated on the total, 

 is thus 3'3. As the numbers of this species marked are 

 relatively large, the higher proportion of reappearances 

 among birds which were caught for marking, as compared 

 with those marked as nestlings, is at first sight rather 

 striking ; the records of the caught birds, however, are to a 

 large extent due to the trapping activities of the markers at 

 particular places, and the number of reappearances has thus 

 become inflated. 



SER. XI. — VOL. III. 2 L 



