IV PREFACE 



teaching forest management for the past four years. Nothmg 

 so quickly reveals the defects of a book as using it for a text. 

 To this experience are traceable the new diagrams and the am- 

 pHfication of the section on the normal forest and its attributes. 



Last but by no means least of the sources of assistance, has 

 been the wealth of new data revealed in the forestry literature 

 of the past four years. This has made it possible to diversify 

 the examples used to illustrate the various methods of regulating 

 the cut by introducing other species than the overworked 

 western yellow pine of the first edition. 



Throughout, I have endeavored to revise and improve the 

 original text so as to embody all the recent developments in 

 forest organization. In doing so I have drawn freely on the 

 work of my colleagues in the profession of forestry and I take 

 this occasion to acknowledge my indebtedness. 



A. B. Recknagel. 

 Ithaca, N. Y. 



Jan., 1917. 



