150 Adams, Ecological Succession of Birds. ["April 



concerned, almost no attention has been given, in spite of its 

 fundamental relation to crop rotation and the corresponding avian 

 succession attending this. Indeed there seems to be a very de- 

 cided need of a thorough investigation and discussion of the 

 general principles underlying all these economic problems, that 

 they may be brought into harmony with the advances made in 

 some other phases of ecology. 



Hull Zoological Laboratory, University of Chicago. 

 October 21, 1907. 



References. 



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