FOREST PLANTATIONS. [Jan. 



overtop or 'whip another. Refpeft fhould be had 

 to the distance of the tops, not to the diflance of 

 the roots of the trees ; for fome kinds require 

 much more head-room than others ; and all trees 

 do not rife perpendicular to their roots, even on 

 the moft level or fheltered ground. 



With refpect to the final distance to which 

 trees, ftanding in a mixed plantation, fhould be 

 thinned, it is hardly poffible to prefcribe fixed 

 rules ; circumftances of health, vigour, the fpread- 

 ing nature of the tree, and the like, muft deter- 

 mine. Whether the trees are to be fuffered to 

 (land till full grown; which of the kinds the foil 

 feems bed fitted for ; whether the ground be flat 

 or elevated ; and whether the fituation be expofed 

 or fheltered, are all circumftances which muft in- 

 fluence the determination of the ultimate diftance 

 at which the trees are to ftand. It may, however, 

 be faid in general, that if trees be allowed a dif- 

 tance of from twenty-five to thirty feet, accord- 

 ing to their kinds and manner of growth, they 

 will have room enough to become large timber. 



OF THINNING GROUPED PLANTATIONS. 



Here two things muft be confidered, namely, 

 whether the plantation be fimply grouped ; or, 

 whether it have been mixed with'nurfe plants, with 

 the intention of being afterwards grouped. 



In 



