METHOD OF VALUING GROWING TIMBER. 28^ 



III. 



Method of ascertaining the Value of Growing T'mher Trees, 

 at different and distant Periods of Time. By Mr. Charles 

 Waistell, of High Holborn. 



(Continued from p. 1 44. J 



Observations on the Tables respecting the Thinning of fVoods, 

 and their Produce. 



.R. Salmon is the only person I know of, who has One fifth of 

 given a general rule for thinning plantations. But as 1 '"eir height 

 conceive his distance of one fifth of their height would oaks, 

 leave oaks too close, especially after they had acquired a 

 sufficient length of stem, I have calculated both on his not for firs. 

 plan, which is proper for fir trees, and also at greater dis- 

 tances. 



The preceding Tables VI, VII, and VIII, are calculated Tables calcu- 

 on a supposition, that the trees are never suffered to stand l^»'ed at one 

 nearer, on an average, than one fourth of their height; and 

 although the quantities of timber thinned out and left 

 standing on the ground at that distance, at the end of 60 

 years, is only two thirds of the quantity according to Mr. 

 Salmon's distance, yet I sui)pose it will be generally thought 

 an ample produce, and sufficiently encouraging. 



According to Table VI, which is calculated for oaks, the Thinn'ng of 

 first thinning is at tixteen years old, and the second at "^'^*" 

 twenty ; but it is the advice of an eminent planter, (Mr. 

 Pontey,) to begin thinning at about thirteen years old, ac- 

 cording to the state of the trees, and to cut out about 150 

 poles per acre annually, for the next seven years. Without 

 putting any value upon the thinnings before 20 years old, 

 we find that at the 20th and 24th years, the thinnings mea- 

 sure 945 feet, the value of which, at a low estimate, will 

 be sufficient to repay the rent and taxes of ground of u 

 moderate quality, with the expense of plants, planting, 

 and after-raanagenaent, calculated at 5 per cent compound 

 interest. 



When 



