PREFACE 19 



I have also received much assistance which I desire 

 frankly and gratefully to acknowledge, from the many 

 Government publications written by such well-known 

 authorities as David Griffiths, F. Lamson-Scribner, V. 

 K. Chestnut, E. V. Wilcox, Dr. C. Hart Merriam, Ver- 

 non Bailey, James T. Jardine, Richard W. Hickman, D. 

 E. Salmon, Herbert T. Osborn, C. D. Marsh and others, 

 who are always so reliable and thorough in their inves- 

 tigative work. In identifying the various plants and 

 grasses the work "American Grasses," by F. Lamson- 

 Scribner, constituting Division of Agrostology Bulletins 

 Nos. 7, 9, 17 and 20, has been of the greatest assistance 

 and frequently consulted. 



The labor involved in getting together the material 

 for this volume has been considerable, but the pleasure 

 derived and the information gained, made it indeed a 

 labor of love and well worth while. If the book is of 

 use to the young men who are taking up forestry as 

 their life-work, in assisting them to a better understand- 

 ing of some of the many problems which they will meet 

 in handling grazing matters upon the forests, or to stock- 

 men themselves in managing their herds, the writer will 

 feel well repaid for his work. 



WILL C. BARNES. 

 Washington, D. C, July, 1913. 



