56 THE PRINCIPLES OE HANDLING WOODLANDS 



obvioush' no longer making a satisfactory growth, and 

 he leaves the thrifty trees for a later ctit. Thus, while 

 no growth study is made, the limitation of cut is really 

 based on growth. 



Application of a Diameter Limit 



In selecting the trees for cutting, one takes all trees 

 above the diameter limit determined upon, unless there 

 is some reason for leaving them, and leaves all trees 

 below it, unless there is some reason for taking them. 

 The reasons for leaving trees above a chosen diameter 

 limit may be the following: 



1. Where it is necessary to leave one or more trees 

 for the distribution of seed in an opening. 



2. Where the removal of a tree would expose a 

 group of trees below the limit to damage by windfall. 



3. Where a tree is very thrifty and increasing in vol- 

 ume and value very rapidly. 



4. Where the removal of a tree, or group of trees, 

 would result in erosion or serious damage to the soil 

 from drying. 



5. Where it is desirable to leave a tree, or trees, for 

 esthetic reasons, as, for example, near roads of other 

 public places. 



6. Where the policy of management requires the 

 leaving of a few prime trees for the production of ex- 

 ceptionally high grades. 



The circumstances under which trees below the limit 

 are cut are as follows: 



