PREFACE 



Acknowledgments are due to Mr. Madison Grant, Dr. W. 

 T. Hornaday and Dr. Charles H. Townsend of the New 

 York Zoological Society; to Dr. N. L. Britton of the New 

 York Botanical Garden; to Director W. H. Fox and the 

 Curators of the Brooklyn Museum; to Dr. C. Stuart Gager 

 of the Brooklyn Botanic Garden ; to Miss Anna B. Gallup of 

 the Children's Museum of Brooklyn, and to the President, 

 Director and Curators of the American Museum of Natural 

 History for their helpful suggestions and cordial coopera- 

 tion in the work, as well as to Miss Clara M. Beale of the 

 American Museum of Natural History, who has been good 

 enough to read all the proof. 



G. N. P. 



December, 1916. 



IV 



