CLEAEING THE CHOP 



163 



A count back of 40 per cent, from the highest inch 

 class is made; 40 per cent, of 200 is 80. Counting back 

 80, we find that it brings us to the 9-inch class, which 

 contains the average pole. A number of poles of this 

 class should then be felled and accurately measured, to 

 arrive at the average cubic contents per tree. This 

 figure is multiplied by the number of trees per acre, and 

 the result multiplied by the number of acres of this class 

 of timber. In the above table, the average pole in the 

 9-inch class contains 13J cubic feet which, multiplied by 

 200= 2,700 cubic feet in the acre measured. 



An even more accurate method is to find the average 

 pole of each class, and from that the cubic contents of 

 each class; then add these figures together to give the 

 total number of cubic feet on the area measured, as set 

 out in the third and fourth columns of the above table. 

 (These figures are fictitious, and must not be taken as a 

 guide to the contents of any class of tree.) 



* Class containing average pole by Weise's 40 per cent. rule. 



