FOR WHOLE TREES. 



79 



2.0 



1.0 



L_OW \QJ^ 



2O 3O 4O 5O 6O 7O 8O 

 PERCENT OF TOTAL NUMBER OF TREES 



FIG. 84. Curves showing the rate of growth per decade of diameter breasthigh of 

 mature trees. The top curve marked 20" is based upon as many trees as there, are 

 points on the curve (14), and is constructed by arranging these trees in order of rate 

 of growth from the minimum to the maximum, and plotting rates of growth per decade 

 for ordinates and per cent of the total number of trees, which constitutes the sample, 

 for abscissa. The other curves shown in this figure were constructed in like manner. 



