THINNING. 171 



for encouragement of an upright growth, 

 and that the plants may not shoot too much 

 to side branches, they should be confined to 

 moderate distance in youth ; increasing it as 

 they advance in age and size. 



FINALLY, Let the exposed margins of all 

 young plantations be kept thicker than other 

 parts ; in proportion to the degree exposed, 

 age of the plants, tenderness of the kinds, 

 &c. ; and, let the frequency of thinning, and 

 also the distance of the respective plants, 

 be determined by the general vigour of the 

 plantation. 



