FOREST COMMISSIONER S REPORT. 



133 



68 per cent, of the total stand, while those twelve inches and 

 over make up 81 per cent. This is a confirmation of the idea 

 before deveU)ped that to leave the .small trees for future 

 growth calls for no very great sacrifice on the part of the 

 operators of the land. To keep land in constant bearing cer- 

 tainly is one measure of productive forestry, and this, in 

 woods of this kind, is the way to assure it. 



Extracting now from the total score of trees on ^°™ p"**^" 

 this sample acre those between six and fourteen le^uus'. 

 inches in diameter, supposing in other woods a cut of this 

 country for its full-sized trees only, the growth of the twenty 

 years succeeding is then figured, using methods already 

 explained. Next a cut including the twelve inch trees is 

 supposed, and lastly one taking all the merchantable trees, or 

 those down to eight inches at four feet from the ground. 

 Readers of this report, unless they are close students, had 



ACRE ON Grafton— Calculation of Growth Succeeding Cuts of Different 



Degrees of Severity. 



(a) Cut to Standard of Fifteen Inches Four Feet from the Ground. 



900 cubic feet ^rows to 1,421— per year, 26. Rate of growth at compound interest, 

 2.3%. 



2,792 feet board measure grows to 5,378— per year, 129. Rate of gi-owth at com- 

 pound Interest, 3.3%. 



better skip this computation, paying regard only to its results. 

 The upshot of the matter is embraced in the following state- 

 ments : The closer the land is cut the bigger the percentage 

 of growth upon the trees left, while the actual growth in 



