194 



quantity of the most valuable timber; 

 and the matter is not difficult to prove ; 

 as there we have always plenty of subjects, 

 placed in proper situations, or at suitable* 

 distances to work upon, which is never 



the case elsewhere.— ^The thinnings may 



be of considerable value, when the trees 

 are only four feet apart ; we can then have 

 rails, spars, &c. At a further thinning, 

 such value is again increased ; which 

 circumstance will be repeated, as the 

 plants continue to increase in size; be- 

 cause a foot of thick, is of more value than 

 one of small wood : the former is likewise 

 much more saleable. 



It is difficult, if not impossible, to make 

 an estimate of the quantity of timber 

 which may be produced from a certain 

 quantity of good land, in a given time; 

 but it is evident, that such circumstance 

 will be affected by the depth, for two 

 reasons : — the first is, the increased quan- 

 tity which the roots have to work upon ; 



