^^ 



THE MIGRATION OF BIRDS 



^% A CONSIDERATION OF HEllK GATKE'S VIEWS 



F. B. WHITLOCK 



Author of "Birds of Derbyshire," dx., dc. 



(all rights reserved) 



WEARN3 

 COLLECTION 



UonDon 



K. H. POETEE 



7, PRINCES STREET, CAVENDISH SQUARE, W. 



1897 



