SYSTEMS OF CLEAR-CUTTING 123 



then return and cut the remainder in one or several 

 operations. 



The clear-cutting systems which involve more than 

 one operation may be classed under three heads: 



1. Alternate Cleared Strips. 



2. Irregular Cleared Strips. 



3. Progressive Cleared Strips. 



Alternate Cleared Strips. — In the first operation, the 

 strips are cut at more or less regular distances, leaving 

 alternating bands of standing timber between them. The 

 design is to cut from 40 to 60 per cent, of the area clear 

 at the first cutting. It is expected that the clearings will 

 become restocked by seed from the standing timber. 

 When reproduction has taken place on the cleared strips, 

 a second operation is made for the timbered strips be- 

 tween them. 



Location of the Strips. — A regular arrangement of 

 alternate strips is possible wherever the topography 

 permits it. In general, the conditions must be such that 

 the logs may be conveniently taken out of the strips to 

 the road. The simplest conditions are where the ground 

 is level or gently sloping. Logging is then easy, and 

 the strips may be laid off uniformly, and with main 

 reference to reproduction. 



Under these conditions the strips are laid off at right 

 angles or diagonally to the prevailing winds, unless some 

 special considerations require a different arrangement. 

 This manner of cutting insures the best possible distribu- 

 tion of seed over the clearings. It may happen that the 



