ACKNOWLEDGMENTS 



FOR helpful suggestions and criticisms the author wishes 

 to acknowledge his indebtedness to Miss Rhea McCain, 

 Head of the Department of English, Northwestern Ohio 

 Normal College, and to R. E. Horsey, Foreman of High- 

 land Park, Rochester, New York. He is also under obli- 

 gations to the following persons who have read all or part 

 of the manuscript or proofs of the different sections of the 

 book as indicated : 



Part One : Filibert Roth, Professor of Forestry, University 

 of Michigan; O. L. Spousler, of the United States Forest 

 Products Laboratory, Madison, Wisconsin; Frederick O. 

 Grover, Professor of Botany, Oberlin College; Norman 

 Scherer, Assistant Professor of Forestry, Ohio State Uni- 

 versity ; W. P. Holt, Professor of Geography, Northwestern 

 Ohio Normal College; Nelson Swan, Landscape Gardener, 

 Fostoria, Ohio ; J. W. Moyer, High School, Sandusky, Ohio ; 

 Leon Winslow, New York State Department of Education, 

 Albany, New York; Burton E. Livingston, Professor of 

 Plant Physiology, Johns Hopkins University ; Russell Wat- 

 son, Department of Forestry, University of Michigan; and 

 The Forester, Washington, D. C. 



Part Two : E. A. Strong, Michigan State Normal College ; 

 E. B. Frost, Director Yerkes Observatory; C. C. Wylie, 

 United States Naval Observatory ; M. W. Van Cleve, Waite 

 High School, Toledo, Ohio; Louise Colton, Scott High 

 School, Toledo, Ohio; C. M. Brunson, Head of Department 

 of Physical Science, Scott High School, Toledo ; Charles H. 

 Cramer, Sandusky, Ohio ; and Oliver C. Farrington, Curator 

 of Geology, Field Museum, Chicago. 



Part Three : Lynds Jones, Professor of .Zoology, Oberlin 

 College ; Gilbert Pearson, Secretary National Association of 

 Audubon Societies; Robert Wolcott, Professor of Zoology, 

 University of Nebraska; Joseph B. Steere, Traveler, Natu- 



iy 



