104 THE PRINCIPLES OF HANDLING WOODLANDS 



because they would be certain to be damaged by wind- 

 fall. 



The best methods are those of cleared strips de- 

 scribed in later sections. But there are cases where, 

 on account of the logging conditions, it is not feasible 

 to leave standing 40 or 50 per cent, of the stand, as is 

 required by those systems. In this event the stand 

 is cut clear, except that solid blocks of timber, aggre- 

 gating from IS to 25 per cent, of the stand, and well 

 located with reference to the distribution of seed, are 

 left standing. 



Where it is desirable to operate in this manner, it is 

 usually the expectation that it will not be possible to 

 return in a few years — after reproduction is established — 

 to cut the standing blocks. If this were possible, a better 

 system of cuttings would usually be feasible. 



In some instances no cutting will probably be made 

 before the new stand is ready. By that time a portion of 

 the timber left for reproduction will have died or become 

 defective. In such a case the timber which cannot be 

 used is a sacrifice to reproduction, and its original value 

 represents the investment for that purpose. 



Location of the Blocks. — The blocks to be left 

 standing are located with the care and skill that would be 

 used in selecting single seed-trees in the other systems. 

 In locating these areas the following considerations are 

 kept in view: 



1. They must be large enough to withstand the wind. 



2. Thev are located so as to distribute seed as far as 



