grateful to many whose long study and careful 

 thought have done much for forestry. Especial 

 thanks are due to Col. William B. Greeley, head 

 of the United States Forest Service, who not only 

 cooperated in furnishing information, but also per- 

 sonally reviewed the manuscript of this book; to 

 Nelson C. Brown, Professor of Forest Utilization 

 at New York State College of Forestry, a widely 

 recognized authority on the uses of wood; and final- 

 ly, to P. S. Ridsdale, Editor of "Nature Magazine," 

 and Philip A. Rollins, author and historian, whose 

 suggestions regarding presentation of the subject 

 matter proved exceedingly helpful. 



Arthur Newton Pack. 

 Princeton, N. J. 



