54 THE WHITE PINE 



Table IV is the most important of the series 

 for practical use. It was constructed from 

 Table I in the manner explained in the para- 

 graphs which follow. 



Inasmuch as one board foot is a board one 

 foot long, one foot wide, and one inch, or -^ of 

 a foot, thick, one cubic foot must be equal to 12 

 board feet of solid wood. 



The actual measurements of the trees in board 

 feet according to Doyle's Rule were thus reduced 

 to cubic feet by dividing by 12, and the rela- 

 tion between the figures obtained and the total 

 volumes of wood and bark given in Table I were 

 computed. The result was as follows : 



Diameter beeast-high, in ikches. 

 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 



Board feet reduced to cubic feet, in percentage of the total volume 



OF wood and bark. 

 12 18 23 26 29 32 35 38 40 42 44 45 46 47 48 49 



This table gives the percentage of loss in 

 manufacturing lumber from the standing tree 

 on the basis of the common standard of measure. 

 It shows an accidental but appreciable relation 

 between the diameter in inches and percentage 

 of wood actually used in commerce at the dif- 

 ferent diameters. But its chief value is in ex- 

 hibiting the enormous loss under the present 



