viii THE MIGRATION OF BIRDS 



CHAP. PAGE 



VII. Migration and Weather ..... 83 



Knowledge of Approaching Weather Favourable and 

 Unfavourable Conditions Importance of Winds Cyclonic 

 and Anticyclonic Winds Continental Migration. 



VIII. The Perils of Migration ..... 104 



Contrary Winds Lighthouses and Lightships Lee- 

 ward Drift Catastrophes. 



IX. Early Ideas of Migration . . . . .114 



Literature Hibernation Carriage of Small by Large 

 Birds. 



X. Suggestions and Guesses . . . . .119 



Trans- Atlantic Migration Ship-borne Wanderers 

 Storm-blown Birds Casual Wanderers Swimming and 

 Walking. 



xi. summary ........ 126 



Bibliography . 131 



Index . . . . . . . .135 



