iv PREFACE 



rial has also been collected on trips during 1913, 191 7, and 1918, to 

 various European countries. Brief bibliographies are appended at the 

 end of each chapter. These were used, to some extent, as sources of 

 information and can be consulted for further study in each subject. 



I am greatly indebted to Dr. Hugh Potter Baker and members of the 

 faculty of the New York State College of Forestry at Syracuse and to the 

 United States Forest Service and various individual members of its staff 

 for a number of excellent suggestions as well as material. I am also 

 grateful to the Bureau of Chemistry, the Census Bureau, and Bureau of 

 Foreign and Domestic Commerce, for statistical material. 



I wish to acknowledge my special gratitude to the following specialists 

 in their respective fields for review of the various chapters: Mr. A. R. 

 Joyce of the Joyce- Watkins Tie Co. for reviewing the text of the chapter 

 on Cross Ties; Mr. Samuel B. Sisson of the S. B. Sisson Lumber Co., on 

 Poles and Piling; Mr. J. C. Nellis, Assistant Secretary of the National 

 Association of Box Manufacturers, on Boxes and Box Shocks; Mr. E. A. 

 Brand of the Tanners' Council of the United States and Mr. Henry W. 

 Healey, formerly of the Central Leather Co., on Tanning Materials; Mr. 

 Thomas J. Keenan, F. C. S., Editor of Paper, on Wood Pulp and Paper; 

 the editorial staff of the India Rubber World on Rubber, and Mr. S. J. 

 McConnell of the Keery Chemical Co., on Hardwood Distillation. The 

 chapter on Softwood Distillation has been reviewed and corrected by a 

 prominent operator in the South who requests that his name be with- 

 held from publication. 



It was originally deemed advisable to include chapters on such other 

 important materials as certain medicinal and chemical products of the 

 forest, as well as camphor, palm oils and other foreign commodities, 

 and to discuss the relation of the subjects treated to the present and future 

 of forestry in this country. However, it was found that on account of 

 the necessity for economy in space, it would not permit the inclusion of 

 a more elaborate treatment. Many of the chapters have already been 

 curtailed for this reason. 



Nelson Courtlandt Brown. 



July, 1919. 



