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iniches broad, and as much in length ; alP- 

 ter which, no more is to be done to it, till 

 the autumn or spring foilowing, when 

 upon taking off the bark all round the 

 wound, it will be observed, that the tree 

 has got an additional covering, or coat of 

 wood, occupying the place the bark did 

 the year preceding, the edges of which 

 will project somewhat over the wound, 

 and shew its shape, as clearly, now in the 

 wood, as previously it did in the bark; the 

 thickness of the covering will always be 

 m proportion to the vigour of the tree, 



Now except it could be shewn, that 

 the situation of the sap-vessels, and the 

 manner in which trees are enlarged, are 

 different from what has been described, 

 (which we believe will not be attempted,) 

 it will be obvious, that after the Ivy has 

 completely invested the stem, in all direc- 

 tions, its annual swell will soon occasion 

 a tightness sufficient to prevent the sap 

 vessels from performing their functions; 

 4 



