ROTATION FOR COMMERCIAL EXPLOITABILITY. Ill 



A tree how 16* in diameter and worth say £1 would, in 20 years, 

 measure 20* in diameter and be worth £2-8-0. In 20 years more 

 the diameter would be 24* and the price nearly £5, or double that 

 20 years previously. 



Such data as the above enable us to institute the same kind of 

 comparison between values at different ages, as was pointed out 

 higher up in the case of coppice standards. But we must be very 

 careful that much more is left here to individual judgment than in 

 the latter case, both as regards the determination of the basis of 

 calculation and the application of the method to trees greatly 

 differing in the manner of their growth. 



