PLATE VII. 



Chart of North-Western Europe showing Typical Weather 

 Conditions, with the Wind North-Easterly, over the British 

 Isles 



The region of highest pressure lies between the Hebrides and Iceland, 

 with gentle gradients extending to and over the northern half of the British 

 area and the southern and central portions of Scandinavia. The area of 

 depression is centred to the south-east with a considerable gradient reaching 

 across the southern half of the North Sea. 



This type of weather is the most favourable of all for intermigration, in 

 both spring and autumn, between the British area and Iceland ; while it 

 is also propitious for movements between our shores and those of 

 Scandinavia at both seasons. 



Such conditions are, however, unfavourable for movements to and from 

 the British Isles and the countries lying to the south and south-east of them. 



