212 



Proceedings of the Royal Physical Society. 



caught on their early autumn passage at a duck-decoy on Fano, an island 

 off the south-west of Denmark, where they were marked and liberated. 

 Some of these were reported from Holland, many from the British Isles, 

 notably from the south of England and from Ireland, many from the western 

 sea-board of France, and one each from northern Italy and southern Spain. 

 But a single Swedish record is the only indication we have of the direction of 

 these birds' summer-quarters. The noteworthy feature in this case is, that 

 about 25 per cent, of the birds marked in autumn were reported as shot or 



Migration of Hooded Crow (Corvus comix) [after Thienemann]. 



Each cross in the shaded area represents the locality of the subsequent 

 death or recapture of a Hooded Crow caught, "ringed" and released at 

 Kossitten while on its migration. [Rossitten, named on the map, will be 

 seen at the very south-eastern corner of the Baltic Sea.] 



captured during the next few months. Quite apart from migration, these 

 statistics are of much interest (Mortensen, Yiddish. Mcddel. fra den naturh. 

 Foren. i Kjohenhavn, 1908, pp. 127-139). 



Dunlins (Tringa alpina) marked at Bossitten on passage have proved of- 

 some interest. A couple of records mark out the route along the Baltic 

 coast, and this is extended by records from Essex, from the Gironde estuary, 

 and from the neighbourhood of the Bhone delta (Thienemann). The theory 

 that these points trace out a route is based on the assumption that there is a 

 single, definite fixed route. This, of course, is only provisional, and it will 

 be obvious that if these records have been multiplied considerably, and if all 

 the localities still lie along this route, the assumption may be made with 

 reasonable certainty. 



