be 



MEASUREMENT OF AVHOLE WOODS. 



The advantages of Draudt's method are : — 



(1.) That the sample trees can all he worked up together ; 



and 

 (2.) That it 3 ields a high degree of accuracy. 

 Its drawhacks are : — 

 (1.) That, in rounding off the numher of sample trees in each 



class, inaccuracies are likely to he introduced ; and 

 (2.) That frequently no sample trees at all are taken 



from classes, which contain only a small number of 



trees. 

 The larger the wood, that is to say, the greater the number 

 of trees in the several classes, the more accurately the method 

 works. 



Example. — The example on page 55 will further explain the 

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



Calculation of Volume, 



