THE MIGRATION OF BIRDS 



A CONSIDERATION OK HERR GATKE'S VIEWS 



F. B. WHITLOCK 



Author of " Birds of Derbyshire," d'C, dtc. 



(all rights beserved) 



Xon&on 



E. H. POETEK 



7, PRINCES STREET, CAVENDISH SQUARE, W. 



1897 

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