URICH S METHOD. 



57 



The method has the disadvantage that the basal areas must 

 be calculated before the sample trees can be selected. Urich 

 proposes to avoid this by estimating the sizes of the sample 

 trees in the several groups, a procedure which may lead to 

 inaccuracies. 



Example. 



ACCORDING TO URICH'S METHOD. 



v _ 88-36 x 1462-51 , _ fi1 

 -- - 34581 ' 



