Xll 



CONTENTS 



Reserving groups of seed-trees 

 Reserving thrifty standards 

 Clear-cutting in two or more operations 

 Alternate cleared strips . 

 Irregular cleared strips . 

 Progressive cleared strips 

 Use in this country 

 Clear-cutting in patches 



PAGE 



116 

 118 

 121 

 123 

 128 

 132 

 134 

 135 



Chapter IV. The Shelterwood System . . 137 



Underlying principles of the shelterwood system . 137 



Advantages of the system . . . .137 



Disadvantages of the system .... 140 



Variation in application .... 140 



Primitive application of the system . . . 141 



Application in the longleaf pine forests . . 142 



The first or seed-cutting . . . 144 



The second cutting ..... 145 



Results . 146 



Application in the Black Hills .... 147 



The first cutting ...... 149 



The second cutting ..... 150 



Progress in the development of the shelterwood 

 system . . . . . . . .150 



Intensive application of the shelterwood system . 152 



Shelterwood S3 r stem with uniform cuttings . .153 



The preparatory cuttings .... 153 



The seed-cutting ...... 156 



The removal cuttings ..... 161 



Shelterwood cuttings in strips .... 162 



Shelterwood cuttings in groups .... 164 



The two-storied system ..... 166 



