THE GLACIAL RANGE CONTRACTION, ETC. 77 



which regard our islands as their refuge because it is 

 the area from which they emigrated north or east to 

 colonize other lands in past ages. These species are 

 indicated in the following table. 



Passing from the species that are resident in our 

 islands, or found in them throughout the year, we shall 

 still find the same significant facts presented by those 

 species that are only observed in our area as Winter 

 Visitors. Of these regular winter migrants individuals 

 of the following tabulated species prolong their flight 

 southwards to Iberia, North Africa, and the Canaries, 

 which indicates an ancient range base of those species 



