338 Method of ascertaining the Value 



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 a mo- 

 derate quality, the expense of plants, planting, and after- 

 management, calculated at five percent, compound interest. 



When 23 years old, and at the end or' every fourth year 

 following, up to 120, the trees to be cut out of an acre will 

 measure from 49-5 to 550 feet ; but say 500, at 4s. a foot, 

 on an average, including the value of the bark ; this gives 

 JOO/. which sum divided by 4, leaves 25/. for the produce 

 per acre per annum. Tins deserves the consideration of those 

 who. are inclined to convert young woods into coppices, 

 without leaving a reasonable number of standards. 



It may however be said, that as the trees cut out in thin- 

 . ping plantations are the bad thrivers and underlings, their 

 contents will be less than the average; but, if we take their 

 value at one -half the above estimate, tliat is, after the rate 

 of 12/. lbs. per acre per annum at 28 years of age and up- 

 wards, even this produce must be thought ample, together 

 with the value of the trees left standing. 



Table VI. was constructed chiefly with a view to oaks, 

 their annual increase in circumference varying from {- of arj 

 jnch to \\ inch, the medium of which is one inch. 



Tables VII. and VIII. were calculated for ash, elm, sy- 

 camore, firs, poplars, and other woods of swift growth, 

 their increase in circumference being generally from l£ 

 to 2 inches annually. If ash trees be found to increase 

 after the rates of Table VII. or VIII. they must be exceed^ 

 ingly profitable, at the high prices now given for that timber. 

 Many other observations might be made on Tables VII. and 

 VIII., but these will readily occur to persons interested in 

 quick-growing trees. 



An acre of trees increasing after the rate of Table VI. 

 produces in 64 years little more than half the number of feet 



that 



