228 A MANUAL OF FORESTRY. 



ment under this method, but it would be beyond the 

 scope of this manual to enter into a discussion of the 

 question, under what conditions and in how far they are 

 suited for the purpose. 



3. Execution of the Work. 



The selection of the trees for removal must be most 

 carefully considered, as mistakes made in this respect 

 are difficult to rectify. The main point is, that almost 

 from the first thinning the trees likely to form the final 

 crop are favoured and trained for their ultimate pur- 

 pose. They should consist of -the best trees which are 

 likely to develop into fine, valuable timber-trees of large 

 size; to enable this favoured portion of the wood to 

 reach such proportions in the shortest possible time, 

 much of the rest of the wood must be sacrificed. This 

 must not be done unless the sacrifice is more than 

 covered by the special excellence of the final crop, 

 a case which can only be expected to occur on fairly 

 favourable localities, which insure a special increment 

 of the isolated trees during a considerable period of 

 time. 



