INTRODUCTION 37 



stand over a second rotation. This differs from 

 the scattered seed-tree system in that the trees 

 left standing are much more numerous and 

 are of a character to live through a second 

 rotation. 



f. Clear-Cutting in Strips. The stand is removed 



in a series of strips, and reproduction secured 

 from the uncut portions of the stand. 



g. Clear-Cutting in Patches. The stand is removed 



by a series of clear-cuttings in irregular patches 

 of limited size, and reproduction secured from 

 the side. 



C. THE SHELTERWOOD SYSTEM. 



1. Cuttings Distributed Uniformly. The stand is re- 

 moved gradually by a series of thinnings; each thinning 

 extends throughout the stand, and gives it a uniform 

 character. The new stand starts under the shelter of the 

 trees left standing, which act as a protection. The whole 

 stand is usually removed within a period of twenty to 

 thirty years. 



2. Cutting in Groups. The stand is removed grad- 

 ually by a series of thinnings which are not uniform 

 over the whole area, but concentrated on groups from 

 which, as centers, the reproduction is progressively se- 

 cured. 



3. Cutting in Strips. The stand is removed gradually 

 by a series of thinnings, the work proceeding in progres- 

 sive strips rather than uniformly over the whole stand. 



