U6 



Radnor, Jind Derby. On the 4tli numbers of Swifts reached 

 North and Mid-Wales, and the first arrivals penetrated into 

 Lancashire and Yorkshire. On that day the second contingent, 

 which had arrived on May the 2nd, began to move northwards 

 and was recorded from Staiibrdshire, Wiltshire, and South 

 Wales. 



In the same way each successive contingent could be 

 accurately traced on its way north through Wales and the 

 west of England into Lancashire, Yorkshire, and the Isle of 

 Man. 



The birds, which arrived in Hampshire on May the 4th, 

 ajtpear to have spread much more gradually in an easterly 

 and north-easterly direction. They seem to have passed into 

 Berkshire and thence into Oxford, Buckingham, Cambridge, 

 Hertford, Surrey, and Essex, while smaller numbers penetrated 

 into Sussex, Kent, Middlesex, Norfolk, Lincoln, and Notts. 



It is thus clear that the birds in the eastern and south- 

 eastern counties arrived from the west, and that while Swifts 

 were already fairly numerous in the west and north, the 

 number in the east was small until the arrival of the 

 following immigration. 



A few birds reached Northumberland on M;iy the 9th and 

 a larger number were recorded from Westmoreland on the 

 11th. 



On May the 14th the second immigration commenced with 

 the arrival of large numbers on the coasts of Sussex and Kent, 

 and some of these passed due north into Essex on the same 

 day. A further arrival took place in Sussex on the 15th, 

 in Hampshire on the 16th, and in Devon on the 17th. 

 Apparently these birds passed north and north-west into 

 Buckingham on the 15th and into Oxfordshire on the 17th. 

 The Devon birds passed north into Somerset and Wales on 

 the 18th, while the others reached Derby on the same day. 



On the 19th the later arrivals in Sussex and Hampshire 

 passed into Surrey and Hertford, while the western birds 

 reached North Wales and Lancashire on the same day and 

 Yorkshire on the 21st. 



