PREFACE. 



This book has been prepared especially for the classes in 

 forestry in the School of Agriculture of the University of 

 Minnesota. It is really a compilation of the lectures and 

 mimeographed notes that I have found useful in my experience 

 in teaching the elementary principles of forestry. The word 

 forestry is here used in the broad sense in which it is often 

 used in this section and includes much that, strictly speaking, 

 would come under several allied heads. In the use of botani- 

 cal names I have followed, so far as possible, those given by Dr. 

 George B. Sudworth in his "Nomenclature of the Arborescent 

 Flora of the United States," which has been adopted as the 

 standard for the Agricultural Colleges and Experiment Stations. 

 Otherwise the Index Ke wen sis has been followed. But where 

 these names are different from those commonly used by 

 horticulturists in current literature the more familiar term is 

 also generally given in brackets. 



I have received many kind suggestions and criticisms 

 from Dr. Otto Lugger, St. Anthony Park; Hon. L. R. Moyer, 

 Montevideo: and Messrs. John S. Harris, LaCrescent: Clarence 

 Wedge, Albert Lea; F. H. Nutter, Minneapolis, and J. M. 

 Underwood. Lake City. Professor Conway MacMillan has 

 furnished many specimens for drawings. My assistant, Mr. 

 W. A. Wheeler, has given much cartful attention to the re- 

 vision of the manuscript and has corrected many errors that 

 would otherwise have crept in. I am especially indebted to 

 all these parties who have aided me in this work, and I wish 

 to extend my sincere thanks for their interest and kindness. 



The drawings, with few exceptions, have been made 

 under my direction by Miss M. M. Cheney. The half-tone 

 illustrations are mostly from photographs taken in the division 

 of Horticulture at various times. The figure of a fire break 

 on the "Grande Dune." is from a print loaned me by Mr. 



