Study of Current Growth 



457 



of that diameter as given in column 2, gives, the percent of growth 

 for each diameter class. These percents of growth are tabulated 

 in column 6. 



Note: The voluine table used is based on the Vermont Rule and was 

 constructed by the frustum form factor method (Forestry Quarterly, 

 Vol. X(1912), p. 215— Proceedings, Society American Foresters, Vol. Ill (1908), 

 p. 278. 



The following tabulation, Table II, shows the results which were 

 obtained by the above method for one stand, and form class on an 

 800-acre tract, in the town of Sherburne, Vermont. 



These growth percent figures for each species and diameter, 

 if averaged in proportion to the volimie of each diameter class in 

 the voltmie estimate, will give a true average percent of growth 

 for all the diameter classes so averaged. This figure, applied to 

 the total volimie of those diameter classes of the given species, 

 gives the volume growth for that species, over the whole stand, 

 for the diameter classes included. 



