vi THE MIGRATION OF BIRDS 



have given me light. In particular I tender thanks 

 to Mr Wells W. Cooke for his permission to repro- 

 duce the maps facing pp. 76, 78, 80. I have 

 found his writings and those of Herr Otto Herman 

 and Mr W. Eagle Clarke especially valuable. Mr 

 Eagle Clarke's long looked-for book on Migration is, 

 as I write, still in the press ; had mine been more 

 than a manual I should have hesitated to publish 

 until his had appeared. 



T. A. COWARD 

 BOWDON, CHESHIRE, 

 4 November 1911. 



