SECT. I. WOUNDS. 477 



SUBSECTION VI. 



Grafting. In this operation there is a wound 

 both of the stock and graft ; which are united, as has 

 been shown in a former chapter, not by the imme- 

 diate adhesion of the surfaces of the two sections, but 

 by means of a granular and herbaceous substance 

 exuding from between the wood and bark, and in- 

 sinuating itself as a sort of cement into all open 

 spaces : new wood is finally formed within it, and 

 the union is complete. 



SUBSECTION VII. / 



Felling. Felling is the operation of cutting down 

 trees close to the ground which many of them wijl 

 yet survive, if the stump is protected from the in- 

 juries of animals, and the root fresh and vigorous. 

 In this case the fibres of the wood are never again 

 regenerated, but a lip is formed as in the case of 

 pruning ; and buds, that spring up into new shoots, 

 are protruded near the section : so that from the old 

 shoot, ten, twelve, or even twenty new stems may 

 issue according to its size and vigour. The stools of 

 the Oak and Ash-tree will furnish good examples ; 

 but there are some trees, such as the Fir, that never 

 send out any shoots after the operation of felling. 



