ZOOLOGIA 



9 



SCIENTIFIC CONTRIBUTIONS OF THE 

 NEW YORK ZOOLOGICAL SOCIETY 



VOLUME I, NUMBER 1 



GEOGRAPHIC VARIATION IN BIRDS 



WITH ESPECIAL REFERENCE TO 



THE EFFECTS OF HUMIDITY 



By C. William Beebe 



Curator of Birds 



PUBLISHED BY THE SOCIETY 

 THE ZOOLOGICAL PARK, NEW YORK 



September 25, 1907 



