IV. 



fort in the preparation of this book has been to give the reader 

 the benefit, at every point, of his own experience and observation 

 and of his scientific studies and researches. 



The writer is so largely indebted to many scientific writers 

 and authorities that he feels that his labors have been more those 

 of an editor and compiler than of a writer. This observation ap- 

 plies especially to that portion of the book dealing with the diseases 

 of the ginseng plant. A cheerful and grateful acknowledgment 

 of these authorities has been made wherever they are quoted. 



Sincerely, 



J. H. KOEHLER, Wausau, Wis. 



