430 Ohseruations on growmg TimleY, 



years ago, that could not be less than 300, and some of 

 them probably 400 years of age, and even more. In Hun- 

 ter's Evelyn's Silva is given the circumference of 10 trees, 

 and not one of which was probably less than 500, and sonle 

 of them probably 1000, years old. 



Lord Bagot*s tree of 200 years old, above mentioned, 

 would, at the present price of 35. a foot, be worth 16/. 109. 

 Supposing that 3.v. a foot should continue to be the ppice 

 of oak-timber for the next 200 years, we will inquire 

 what sum might be raised by growing four oak-trees in 

 succession, upon the same spot of ground, each tree to be 

 cut down when 50 years of age, and that their boles should 

 be of the same length as that of Lord Bagot*s, viz. 22 feet. 



I fix on fifty years of age, as being convenient for my 

 calculation ; and nearly the most profitable period at which 

 to cut down trees of 22 feet bole, which haVe grown at the 

 medium rate of one inch in, circumference, and 12 inches 

 in height annually. 



After its 52d year, such a hole ceases increasing, after 

 the rate of 5 per cent, per annum* : but the whole tree, in- 

 cluding the top part above the bole, may continue increas- 

 ing after that rate until its 6 1st yearf. 



I do not fix on 50 years of age as being the most profit- 

 able ase at which to cut down trees ; probably 60 or TO 

 years of age would in some instances be preferable. Sup- 

 posing an oak-tree haS increased as above mentioned, its 

 bole of 22 feet would, at 50 years of age, measure 39 

 inches In circumference at the middle, and one-fourth of 

 this, namely 9f inches, squared and multiplied into 22 feet, 

 its length gives 14 feet 6 inches for its contents, which at 

 35. a foot, its present value, amounts to 2/. 35. GcL, Sup- 

 posing 2/. 3s. Qd. to be the value of each of the four tree* 

 of 50 years of age, grown in succession upon the same spot 

 of ground, in the period of 200 years, w^e will calculate 

 to what the three first trees would amount, if their value 

 was placed out at compound interest, for the respective 

 terms of 150, of 100, and of 50 years. 

 £, s, d. ^. s. d. 



2 3 6 Accumulating during 150 years, at 

 5 per cent, per annum compound 

 interest, will amount to - 3,280 O 

 2 3 6 Accumulating as above for 100 



years, would amount to - 286 O 



♦ See Table 12 cf a bole of 24 feet, in the 2Cth volume of the Society'*. 

 Transactions, page 68. 

 t See niy firrt Tablfe in ditto, page 49. 



Accu* 



