FOR W1IOLK TREES. 



81 



22 



26 30 34 38 



DIAMETER BREASTHIGH INCHES 



42 



46 



FIG. 86. Curves obtained directly from Fig. 84, showing rates of growth per decade 

 >f diameter breasthigh, of mature trees. These curves show rates for the lowest ten 

 per cent of trees, next to the lowest ten per cent, etc., to the highest ten per cent. 

 The average curve is plotted from averages of all rates for each diameter class 



619905 



