CONTRIBUTORS 



John Langdon Brooks, Osborn Zoological Laboratory, Yale Uni- 

 versity, New Haven, Connecticut 



Hampton L. Carson, Department of Zoology, Washington Uni- 

 versity, St. Louis, Missouri 



Verne Grant, Rancho Santa Ana Botanic Garden and Claremont 

 Graduate School, Claremont, California 



John Imbrie, Department of Geology, Columbia University, New 

 York, New York 



Ernst Mayr, Museum of Comparative Zoology, Harvard Univer- 

 sity, Cambridge, Massachusetts 



John A. Moore, Department of Zoology, Barnard College and 

 Columbia University, New York, New York 



C. Ladd Prosser, Physiology Department, University of Illinois, 

 Urbana, Illinois 



T. M. Sonneborn, Department of Zoology, Indiana University, 

 Bloomington, Indiana 



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