FORM FACTORS. 



39 



The following table shows the form factors for a number of 

 species : 



FORM FACTORS FOR THE SCOTCH PINE ACCORDING TO KTJNZE, 

 SPKUCE AND BEECH ACCORDING TO BAUR, AND SILVER FIB 



ACCORDING TO LOREY. 



In using these tables, it must not be forgotten that they 

 give the averages of numerous measurements ; hence they do 

 not give reliable results in calculating the volume of a single 

 tree. Their application should be restricted to the calculation 

 of the volume of a number of trees, in other words of whole 

 woods, where the differences between the several trees are 

 likely to compensate each other. 



3. Estimate of Volume ~by means of Volume Tables. 



If, instead of giving the form factors only, they are multi- 

 plied by the corresponding heights and basal areas, the 

 volumes of the trees are obtained, which can be arranged into 

 so-called " volume tables." The latter can be denned as tables 

 which give the volume of single trees arranged according to 

 species, age, diameter, and height of tree. 



