PLATE VIII. 



Chart of North-Western Europe showing Typical Weather 

 Conditions, with South- Westerly Winds, over the British 

 Isles 



A depression lies to the north-west of our area, and embraces Iceland and 

 the Faroes ; while an anticyclone to the south of us covers the greater part 

 of France. Wind south-westerly over the British Isles and North-Western 

 Europe. 



South-westerly weather is favourable for intermigration between England 

 and Southern and Central Europe, i.e.^ tor the arrival of summer visitors on 

 our southern shores in spring, and for the departure of emigrants from them 

 in autumn. It is also suitable for the passage movements (to the east in 

 spring and west in autumn) across the southern waters of the North Sea, 

 between the south-eastern shores of England and those of the Continent 

 lying in the same latitude. They present, however, weather barriers to the 

 performance of migration between Northern Europe and Iceland_and the 

 British Isles. 



