— 175 — 



such a trend from the general trend of vital phenomenon, nor from the 

 relationship existing between G, D, H. c and V and the age, and from 

 the mutual relations in ic, N, G, D, H, t and V. 



(/i) On the total basal area per unit area. 



The fluctuation of the index number for the total basal area per unit 

 area does not take the similar direction with any other factor, though 

 the characteristics of the fluctuation is similar, i. e., this differs only in 

 the smallness of the angle of the direction. So the equation to the curve 

 of the total basal area per unit area may be expressed by the formula: 



^ 



G=ce * 

 Again this equation may be readily deduced from the relation Nfli=G, 

 i. e., from the previous study on the equations of N and D with respect 

 to the age, we have 



where -^''1^^^='^ and 2ai— 7i — fi- 



4 



Now applying the equation to the given data, we find: 

 for a stand with "a" grade, 



19 .3105 

 G„=52.89e * Probable % Diff. ±2.2% 



for a. stand with "b" grade, 



24.0223 



G6=54.31e * Probable % Diff. ±2,7% 



for a stand with " c " grade, 



25.7700 



G =55.42e * Probable % Diff. ±3.2% 



