APPLICATION OF THINNINGS 



^85 



bringing the trees to the ground is overcome and the logging 

 is cheapened because the felled material is concentrated in 

 the lanes. 



When the same stand is thinned a second time the lanes 

 can be run at right angles to those cut in the first operation. 

 In principle a thinning of tliis character is not fully satis- 



Fig. 75. 



Portion of a dense stand of 60 year old timber treated with a strip thinning 

 Strips 10 feet in width have been cut leaving uncut strips 18 feet wide. The 

 trees on the edges of these strips have opportunity for increased growth. 



factory but does furnish opportunity for the trees on the sides 

 of the clear cut lanes to increase their rate of growth. (See 

 Figs. 75 and 76.) 



Application of Thinnings. — It has already been indicated 

 that thinnings should be started as early in the life of the 

 stand as the need arises, but that in practice they are Hkely 

 to be deferred on account of the cost until the time when the 

 material removed can pay for the operation. This is a good 



