VOLUME TABLES 55 



methods. Less than half the cubic contents of 

 a White Pine forty inches in diameter reaches 

 the market from the saws, and when the diam- 

 eter sinks to ten inches, eighty-eight per cent, 

 of the tree is lost. It should be repeated here 

 that Doyle's Rule gives a much smaller num- 

 ber of board feet, in proportion to their cubic 

 contents, to small logs than to larger ones, and 

 that on the whole it tends to understate the 

 possible lumber product from logs. 



The values in Table I were multiplied by the 

 percentages just given, and the results were 

 multiplied by twelve, in order to convert them 

 back to board feet. 



The diameter and height of a tree being 

 known. Table IV shows at a glance its mer- 

 chantable contents. Where the height and the 

 diameter must be estimated, as is usually the 

 case, it furnishes an easy and accurate method 

 of determining the equivalent of these estimates 

 in board measure. 



