PLANTATIONS. 97 



one who sees them must perceive the necessity 

 of their being relieved without loss of time. No 

 plant, of which we have any knowledge, can 

 exist without light and air, and in proportion to 

 the extent to which they are excluded from Plant- 

 ations, will he the injurious effect produced upon 

 the health of the trees. In fact, it may be laid 

 down as a universal rule, that in proportion 

 to the judgment and discrimination which are 

 exercised in gradually admitting both light and 

 air into Plantations, of almost every description, 

 will be their healthy progress. 



I conclude my remarks on this part of my 

 subject by observing that, having admitted, as I 

 most fully and readily do, that a few instances 

 may be met with in almost every county where 

 the science of Arboriculture is tolerably well 

 understood, and its principles carried out, I must 

 still contend that cases enough may be found 

 First ; of a want of preparation of the ground : 

 Secondly ; of an improper selection of plants, 

 either as to kind or size : Thirdly ; of an unsuit- 

 able admixture of them: Fourthly; of mistakes 



