of Growing Timler Trees, 329 



Chan is usually done, especially when it is increasing after a 

 high rate per cent, per annum*. 



The second Table shows the rate per cent, to be the same 

 as in the first Table, though the annual increase is more both 

 in height and circumference. 



The third Table is calculated to show the number of trees 

 that will stand on an acre of ground, at the distance of one- 

 fifth of their height, (which distance is recommended by 

 Mr. Salmon, in a paper in the Society's 24th volume,) and 

 the number of feet the trees will contain, both those to 

 be cut out, and those to be left standing, at the end of every 

 four years, from 16 to 64 years old, supposingthey increase 

 12 inches in height and 1 in circumference annually. This 

 distance may suit fir trees, but will be too near for oaks. 



The fourth and fifth Tables show the same particulars 

 when the trees grow at greater rates. 



The sixth Table is calculated to show the same particulars 

 when the trees are constantly thinned out, every four years, _ 

 so as to leave them at the distance of one-fourth of their 

 height. According to this table there will be 48 trees left 

 on an acre when they are 120 years old; and it seems ge- 

 nerally agreed, that from 40 to 50 full-grown oak trees are 

 as many as have sufficient room to sand on an acre. 



The. seventh Table shows the same particulars respecting 

 trees which increase 15 inches in height and l| inch in cir- 

 cumference annually. 



The eighth Table shows the same particulars respecting 

 trees which increase 18 inches in* height, and two inches in 

 circumference annually. 



The ninth Table shows the same particulars as Table 6, 

 till the trees are 28 feet high, after which the distance is in- 

 creased from one-fourth to one-third of their height. 



The 10th, 11th, and 12th Tables show the annual in- 

 crease in boles of ?4, 32, and 40 feet long, and the differ- 

 ence of their increase at the same ages. 



* A fir wood of more than SO acres, and about 30 years old, was latelv 

 valued to be sold with an estate, by several eminent wood-valuers, without 

 taking into consideration its rate of increase. It was then increasing' after the 

 rate of 10 per cent, per annum, and probably would increase after the rate 

 of 8 per cent, on an average for the next 20 vear*. 



To 



