CONTENTS 



XI 



PAGE 



Cost of the system ...... 67 



Increased cost of logging .... 67 



Cost of protecting young growth ... 68 



Increased cost of construction work . . 68 



Value of seed-trees ..... 69 



Cost of improvement work .... 69 



Intensive development of the selection system . 69 



Results of the selection system .... 71 



Choice of the selection system .... 72 



Example in the spruce forests of the Northeast . 74 



Chapter III. Systems of Clear-Cutting 



Definition of clear-cutting . 



Conditions requiring clear-cutting 



Disadvantages of a clear-cutting . 



Methods of reproduction . ... 



Advantages of artificial reproduction 

 Advantages of natural reproduction 



Clear-cutting with artificial reproduction 

 Use of the system in this country 

 Use in National forests 

 Use in State forests 

 Use in private forests . 

 Clear-cutting the whole stand 

 Clear-cutting in strips . 

 Clear-cutting in patches 



Clear-cutting with natural reproduction 

 Conditions of success 

 Influence of market conditions 

 Clear-cutting the whole stand 

 Reserving blocks of trees 

 Reserving scattered seed-trees 



83 



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 107 



