34 MKASUREMENT OF FELLED TREES. 



3. Vohune of flic Bark. 



In many cases it is desirable to ascertain the volume 

 of the bark, especiall}' when it is sold separatel}' as in the 

 case of tanning bark. This can be done stereometrically or 

 xylometrically. In the former case the pieces of wood are 

 measured before and after barking, the difference giving the 

 volume of the l)ark. If a xylometer is used, the bark can be 

 measured separately, or the pieces of wood are measured 

 before and after barking. 



According to species, age and locality, the bark comprises 

 from 6 to '10 per cent, of the total volume. Schwappach 

 found on a limited number of trees the following results : — 



Tanning bark is usually sold by weight ; other bark is sold 

 according to measurement, like firewood. 



