CONTEXTS 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 . . 83 



Definition of clear-cutting .... 83 



Conditions requiring clear-cutting ... 83 



Disadvantages of a clear-cutting .... 86 



Methods of reproduction ..... 87 



Advantages of artificial reproduction . . 88 



Advantages of natural reproduction . . 88 



Clear-cutting with artificial reproduction . . 89 



Use of the system in this country ... 90 



Use in National forests .... 90 

 Use in State forests ... .93 



Use in private forests ..... 95 



Clear-cutting the whole stand . . 96 



Clear-cutting in strips . 97 

 Clear-cutting in patches . .97 



Clear-cutting with natural reproduction . . 98 

 Conditions of success ... .98 



Influence of market conditions . . 100 



Clear-cutting the whole stand . 101 



Reserving blocks of trees . . 103 



Reserving scattered seed-trees 107 



