URICH S METHOD. 



55 



method. The data are the same as those used in the previous 

 example, but they have been multiplied by ten all round, in 

 order to obtain a larger number of trees. 



CALCULATION OF VOLUME ACCOEDING TO DEAUDT'S METHOD. 

 Area = 10 Acres. 



I. UricVs Method. 



In order to avoid the slight inaccuracy caused by rounding 

 off fractions of sample trees, Urich proposes to arrange the 

 trees in such groups, that each sample tree represents the same 

 number of trees. For this purpose he arranges the trees in 

 groups, so that each contains the same number of trees ; he 

 then calculates the arithmetical mean sample tree for each 

 group. For the rest he proceeds on the same lines as Draudt, 

 so that he obtains the volume of the whole wood by the same 

 formula, namely : 



