METHOD OF SEVERAL HEICxHT CLASSED 



6 



In some cases it happens, that the different height cLasses 

 are separated according to area, for instance, where a marked 

 change in the qiiahty of the locality occurs, due to change in 

 the soil or subsoil, aspect, etc. In such cases, the wood is 

 divided into as many parts as different height classes appear, 

 and each is treated as a separate wood. 



If the several height classes are mixed over the whole area, 



Beech 



as in irregular selection forests, then the diameter and height 

 must be measured in each case. Where only two height 

 classes are adopted, the height may be estimated, while the 

 diameter is measured, and the tree placed in the one or the 

 other height class. Each of the latter is then considered as a 

 separate wood and its volume ascertained according to one of 

 the methods already described. 



Cases, where more than two height classes, in addition to 



F.M. F 



