THE MIGRATION OF BIRDS 



A CONSIDERATION OF HEllR GATKE'S VIEWS 



F. B. WHITLOCK 



Author of "Birds of Derhyshwe," dc, dc. 



(all bights besebved) 



Xondon 



E. H, POETEE 



7, PRINCES STREET, CAVENDISH SQUARE, W. 



1897 



