PREFACE 



Beal, Wells W. Cooke, T. S. Palmer, H. C. Oberholser, 

 and others of the United States Biological Survey, for 

 which the author desires to make grateful acknowledg- 

 ment. 



Parts of some of the chapters have previously ap- 

 peared in the "Craftsman Magazine" and ''Country 

 Life in America," and are here reproduced by the cour- 

 tesy of the editors. 



T. Gilbert Pearson. 



[vii] 



