io PREFACE 



greatly indebted to the New York Zoological Society, and to those 

 magazines who have published other chapters as separate articles, 

 and have now given their consent to their use in this book, I wish 

 also to acknowledge my grateful thanks. 



Last but not least, to Lillian Carey Howes, upon whom has fallen 

 the main burden of preparing my manuscript for the printer, I make 



grateful acknowledgment. 



PAUL GRISWOLD HOWES. 

 Stamford, Conn., 



January i, 1918. 



