PRESSLER'S TABLE. 



141 



In Determining the Accretion of a Felled Tree the 



volume is computed from actual measurements. By a few trials 

 the top is cut off where the section contains as many rings as 

 there are years in the period for which the accretion is desired, 

 and the height of the tree at that time measured. The difference 

 in volumes past and present gives periodic accretion. The 

 diameter for both the past and present tree may be taken at the 

 middle of the topless stem, and volumes found by multiplying 



