APPENDIX. IX 



It, therefore includes class (5), a large part of class (2) and 

 some of class (1), but not classes (3) and (4), which are left to 

 shelter the soil and help to clean the boles of the selected trees. 



The removal of bad advance growth, etc., if it is likely to 

 cause too great an interruption of the cover, can be spread over 

 more than one operation, but such advance growth should be 

 rendered harmless by lopping or pruning. It is thus practically 

 the same in intensity as a D grade ordinary thinning but leaving 

 classes (3) and (4) instead of removing them. 



(2) Heavy. This grade ia applied in order to favour a 

 definite number of selected stems with the object of 

 producing large timber. It consists then, in the 

 removal of all class (5) trees and other trees which 

 hinder the proper development of the selected trees, 

 i.e. class (5) and some of classes (2) and (1) but not 

 classes (3) and (4). 



This thinning is specially suited to crops nearing the end of 

 the rotation. 



It has already been stated that the essential point of an 

 increment felling is that it does create a lasting interruption of 

 the cover. More trees are removed than in the heaviest D grade 

 thinning; in other words, the selected trees are left more or less 

 isolated, and classes (3) and (4) are not left to cover the soil. The 

 soil, therefore, is not supporting as many trees as it could support 

 and, although the increment per tree is large, there comes a stage 

 when the reduction in the number of trees more than counter- 

 balances the increased increment per tree. Exactly when this 

 point is reached is certainly not known in India. Experiments 

 were being performed in Europe but the problem was not by any 

 means solved in 1912 and probably is not solved yet. Moreover, 

 other points such as the quality of the wood, the value of any 

 imderwood, etc., come in. This subject is still quite in its 

 infancy, and the classification of these increment fellings is only 

 inserted to make the table complete and not because there is any 



