64 



of the notches, and neither from the upper 

 nor lower parts of them, which I am unable 

 to account for. But the notches nearest 

 the head are the first to heal, and those 

 nearest the root the last to heal. 



The new growth on the notches will 

 be free in proportion as they are in 

 the line with large branches above them ; 

 and I imagine from this, that though 

 the returning sap from branches deposits 

 round the whole stem, it deposits most 

 freely on the proper side of the 

 branches ; and the larger annual deposit 

 found on the outsides of the outside trees 

 of plantations, which has been attributed 

 by Duhamel and Buffon to their having 

 their largest roots on that side, is, I have 

 no doubt, the result of their having their 

 largest branches on that side. An exposed 

 tree standing singly will throw out its 

 roots equally all round it ; but the new 

 layers of wood round the stem will be 

 much the largest on the leeward side. 



