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the fame form it is covered with thriving wood, but where the 

 land is nearly level for a length of way inland no wood appears, 

 and every hedge is feen never to rife higher than the top of the 

 bank which proteds it from the wind. Therefore in order to 

 plant near the fea on a low (bore, it is neceffary to commence the 

 plantations a confiderable way inland, and to allow the young 

 trees to have others feveral feet taller than themfelves behind 

 them : thefe will have the fame effed as high land, for by means 

 of the oppofition offered by innumerable ftems and branches the 

 force of the wind will be greatly leffened ; as we may find by 

 {landing on the windward fide of a thick wood during a ftorm, 

 where, if the trees are lofty, the wind is much lefs violent than 

 on an open plain. In water the efFed of this kind of oppo- 

 fition is vifible, for if iiito the bed of a fwift ftream we drive a 

 number of ilckes, the water, although it continues to flow, yet 

 has its velocity -dirninifhed confiderably. 



"Od*. -Srft jjk'fttations in an expofed place ought always to be of 

 fuch trees as are natives of mountain.-, for thefe are fitted by 

 nature to bear the rude blafts of winter, and by the ftiffnefs of 

 their leaves, or flexibility of their footftalks, to remain unin- 

 jured by a fummer ftorm. Of the firft, we have the various race of 

 pines ; of the laft, the Birch, the Afpen and the Mountain Afli *. 



Thus 



• Among the rocks of Agnew's Hill in the County of Antrim, I found the 

 Populu* tremula {Afpen Tree) growing luxuriantly on the eaftern face, at about 



the 



