664 PRACTICAL ORNITHOLOGY. 



seen here on the 18th of April, and two were observed on the 

 20th. The Willow Wren arrived on the 1 5th. The Cuckoo 

 was first heard on the 20th ; the Tree Pipit and Whitethroat 

 on the 23d ; the Sedge Warbler on the 25th ; the Whinchat, 

 Redstart, and Yellow Wagtail on the 28th. My brother states 

 that the Martins did not arrive at Loughborough till the 24-th ; 

 and the Swifts have only come two days earlier than last year. 

 Although the weather has been so fine with us, it may how- 

 ever have been the reverse in the countries to the southward 

 through which the migratory birds had to pass. Yet that 

 their journeys are not determined merely by an increase of 

 temperature, seems from many considerations to be apparent. 



