MODIFICATIONS OF THE GENERAL METHOD. 



53 



THE Arithmetical Meak Sampf^e Tree of the AVhole Wood 

 Pine Wood, 70 Years Old. 



Four Groups. 



Real Sample Trek.s. 



Total 



9-25 

 y-40 



11-.-) 



n-6 



Total 



15-0 

 15 



Total 



Basal 

 Area. 



•223 



•230 



•1'41 

 4-52 



•467 



•482 



•721 

 ■734 



1-227 

 1-227 



S^93 



12^13 

 10-81 



17^43 

 1917 



Volume 



of 

 Gro\ij). 



Mkthod of Arithmetical Mea^ Sample Tree. 



Nunibei 



of 

 Trees. 



2-i54 



27-79 



28-40 



302 



Mean Sample Tree 

 of Wood. 



Basal 

 Area. 



RE.iL Sample Trees. 



Volume 



of 

 Wood. 



9-25 

 9-40 

 9-60 



Total 



-467 

 -482 

 -503 



12-13 

 10-81 

 1163 



34-57 



34^57 X 146-2.50 



= 3,482 cubic feet. 



venience, it has been proposed to fix the number of sample 

 trees in each class so, that 



= a constant = 



^=^ = ^^ = 



Si 8.2 S3 



when the above formula reduces to : — 



V = (Vi + v._, + V3 + . . .) X c. 



By following this method, it is not necessary to keep the 

 sample trees separate; they can be thrown together and 



