134 



FOREST commissioner's REPORT. 



volume or in feet board measure is smaller. The erowth in 

 merchantable material increases at a somewhat hiirher rate 

 than the volume, partly because large trees waste a smaller 

 percentage of their contents than small trees, partly because 

 they scale better, partly because at the end of the twenty 

 year period trees which at its beginning could not be con- 

 sidered merchantable have grown into the merchantable class. 



(b) Cut to Standard of Twelve inches Four FeA from the Oround. 



610 cubic feet grows to 1,015— per year, 20. Rate of growth at compound interest, 

 2.6%. 



1,632 feet board measure grows to 3,653— per year, 101. Rate of growth at com- 

 pound interest, 4.1%. 



(c) Cut to Standard of Eight Inches Four Feet from the Ground. 



100 cubic feet grows to 216— per year, 5. Rate of growth at compound interest, 3%. 

 feet board measure grows to 600— per year, 30. Rate of growth at compound 

 interest, infinite. 



It will be well, finally, to state here, what indeed must be 

 perfectly well known to all readers, that, as a matter of fact, 

 the cut of land to a stated limit does not remove all the trees 

 above that limit and leave standing all the trees below. Con- 



