of Growing Timler Trees. 357 



The timber to be thinned out before the age of 28 years, 

 will be the same as in Table VI., but at 28 years of age there 

 are 583 feet more to be cut out according to this Table than at 

 the same age in Table VI.; there will, however, be less to 

 be cut out between the ages of 28 and 60 years of age. But 

 if the trees in this Table, in consequence of having more 

 room, were to increase \{ inch in circumference annually, 

 instead of one inch after they are 28 years of age, the pro- 

 duce of an acre at 60 years of age would equal the produce 

 stated in Table VI. at the same age; taking into considera- 

 tion that the value of the 583 feet excess cut out at 28 years 

 of age would then be more than quadrupled, if the money 

 were placed out at five per cent, compound interest. A 

 considerable additional increase in circumference may cer- 

 tainly be expected, in consequence of the trees having al- 

 most double the room in which to extend their branches, 

 and for the admission of those powerful agents, sunshine 

 and air* 



Observations on the Tables respecting the Thinning of Woods f 

 and their Produce. 



Mr. Salmon is the only person I know of, who has given 

 a general rule for thinning plantations. But as I conceive 

 his distance of one-fifth of their height would leave oaks too 

 close, especially after they had acquired a sufficient length 

 of stem, I have calculated both on his plan, which is pro- 

 per for fir trees, and also at greater distances. 



The preceding Tables VI. VII. and VIII. are calculated 

 on a supposition that the trees are never suffered to stand 

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

 although the quantities of timber thinned out and left stand- 

 ing on the ground at that distance, at the end of 60 vears 

 be only two-thirds of the quantity according to Mr. Sal- 

 mon's distance, yet 1 suppose it will be generally thought 

 an ample produce and sufficiently encouraging. 



According to Table VI. which is calculated for oaks, the 

 first thinning is at sixteen years old, and the second at 

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



Z 3 Pontey,) 



