XI 1 CONTENTS 



PAGE 



Reserving groups of seed-trees . . . 116 



Reserving thrifty standards .... 118 



Clear-cutting in two or more operations. . 121 



Alternate cleared strips ..... 123 



Irregular cleared strips ..... 128 



Progressive cleared strips .... 132 



Use in this country ..... 134 



Clear-cutting in patches .... 135 



CHAPTER IV. THE SHELTERWOOD SYSTEM . .137 



Underlying principles of the sheltervvood 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 system 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 



