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part, of the care it requires. Grove- 

 timber, and thick plantations generally 

 iland in need of feme attention of this 

 fort. The iirft rule is, to thin it early j 

 the fccond, to d.z it by degrees ; and 

 the third and principal rule of all is, to 

 take Nature for our guide, and clear 

 away fuch trees only as flie points out ; 

 namely, the unhealthy trees ; without 

 paying any great regard to regular dif- 

 tances. 



When thefe rules arc not obferved, 

 the bad confequences are obvious. Trees 

 in thick plantations, when left any con- 

 ilderable time before they are thinned, 

 get too long in their bodies, for the lize 

 of their heads ; and when a frefh current 

 of air is let in upon them, the fap is im- 

 mediately chilled, and the trees checked 

 in their growth. But if they are thinned 

 early, and at different times, they arc 



hardened 



