FOR WHOLE TREES. 



83 



18 



20 22 



26 28 3O 32 34 



DIAMETER BREASTHIGH INCHES 



42 



FIG. 89. Curves showing increase in merchantable volume per decade of mature 

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

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

 to the increase in grown in diameter breasthigh, as shown in Fig. 84, for mature trees 

 of different diameters. 



26 28 30 32 34 36 

 OIAMETER BREASTHIGH-INCHES 



40 42 



FIG. 90. Curves showing per cent of increase in 'merchantable volume per decade, 

 f mature trees of different diameters. These curves are obtained- by expressing the 



alues shown in Fig. 89 in per cent of merchantable volume, or ~ X 100 =: 



curve A! 

 >er cent increase in volume per decade. 



