liUITISH ISLES AM) THEIR MIGRATORY RIRDS 45 



4. The departure from our islands of the Winter Visitors for their 



summer haunts. 



5. The appearance on and journeys along our shores of Birds of Passage 



from the south, bound for summer haunts beyond our isles. 



6. The return of the birds evicted by the severe weather of the 



previous winter. 



7. The appearances of Casual Visitors. 



AUTUM.V. 



1. Local movements from British summer haunts to British winter 



retreats. 



2. The departure from our islands of the Summer Visitors for their 



winter retreats. 



3. The departure for the winter of the Partial Migrants. 



4. The arrival from the north and east of Winter Visitors. 



5. The appearance on our shores of liirds of Passage en route from 



northern and eastern summer haunts to southern winter quarters. 



6. The appearances of Casual Visitors. 



Winter. 



1. The emigration of would-be Resident and ^\'inter Visitors, through 



pressure of severe climatic conditions. 



2. The arrival from the Continent of Liimigrants similarly evicted by 



the weather. 



3. The appearances of Casual Visitors. 



Most of the species play many of these roles as British 

 migrants, as will be learned from the histories of the 

 movements of the several species which will be treated 

 of as typical migrants. Thus, for example, the Song 

 Thrush figures as a summer visitor, a partial migrant, a 

 bird of passage, a winter visitor, and a winter emigrant 

 through eviction. Needless to remark, it is also a 

 permanent resident in our islands, even in Scotland. 



Not only do we witness much migration in the 

 British Islands of a very varied nature, but often through 



