THE MIGRATIONS OF THE SONG-THRUSH 215 



These immigratory movements are observed on the 

 east coast of Britain, from the Shetlands to Norfolk. 

 The Thrush is also abundant on the west coast, includ- 

 ing Ireland, and visits such outlying stations as Sule 

 Skerry, the Flannans, the Monach Isles, St Kilda, and 

 the isolated rocks of Skerryvore and Dhu Hearteach. 



The Thrush's travelling companions, in addition to 

 the species already mentioned, are chiefly the Fieldfare, 

 Ring-Ouzel, and Blackbird. Along with these species, 

 many Thrushes perish at the lanterns of the light- 

 houses and light-vessels, especially when the night is 

 hazy or there is light rain. 



The majority of the winter visitors enter Ireland, how- 

 ever, at the south-east corner, where immense numbers 

 arrive during- October and November from south-western 

 England, many of them after passage along the south 

 coast. 



Many of the immigrants upon arrival, or soon after, 

 proceed as Birds of Passage along our eastern, western, 

 and southern coasts, and finally quit Britain, the 

 majority to seek more southern lands, others to cut 

 across St George's Channel in order to winter in Ireland. 

 Others, again, remain as Winter Visitors, and work their 

 way to inland quarters by overland journeys. Numbers 

 of these birds, however, quit our islands, after a longer 

 or shorter sojourn, under the pressure of severe weather 

 conditions. 



Auhcmn Immigration from Westei'ii Europe. — 

 Investigations at the Kentish Knock lightship, in the 

 autumn of 1903, lead me to conclude that Song-Thrushes 

 cross the southern waters of the North Sea by an east- 

 to-west route from the coast of Holland to that of 

 south-eastern England. During my sojourn on that 



