82 



A MILL SCALE STUDY OF WESTERN YELLOW PINE. 



4O 



42 44 



DIAMETER BREASTHIGH INCHES 



FIG. 87. Curves showing increase in merchantable volume per decade of immature 

 trees of different diameters breasthigh. These curves are constructed by plotting the 

 increment of volume from curve A, the total merchantable volume curve, corresponding 

 to the increment of growth in diameter breasthigh as shown in Fig. 83 for immature 

 trees of different diameters. 



2O 



22 



24 



26 28 30 32 34 36 

 DIAMETER BREASTHIGH-HNCHES 



4O 



42 



FIG. 88. Curves showing per cent of increase in merchantable volume per do 

 of immature trees of different diameters. These curves are obtained by expressing the 



values shown in Fig. 87 in per cent of merchantable volume, or tUrve y 100 



per cent increase in volume per decade. 



curve A 



