PREFACE 
through the courtesy of the Bureau of Fores- 
try, United States Department of Agriculture. 
My grateful acknowledgments are due Mr. 
Overton W. Price, Assistant Chief of the 
Bureau of Forestry, for photographs chosen 
out of his collection to supply the plates 
facing pages 69, 148, 158. The remaining 
illustrations have been reproduced from pho- 
tographs in my own collection. 
Notes of reference, which are indicated by 
superior figures in the text, and an index to 
the names of the trees that have been de- 
scribed or specially referred to in these pages, 
will be found at the close of the book. The 
index has been compiled from a well-known 
bulletin of the Bureau of Forestry, United 
States Department of Agriculture, entitled 
“Check List of the Forest Trees of the United 
States.” Courteous acknowledgment is here 
made to the author, Mr. George B. Sudworth, 
and to the Division of Publications, of the 
same Department, for kind permission to 
make extracts from the bulletin referred to. 
viii 
