154 PRACTICAL TREE REPAIR 



wall to the wood depends upon the degree of 

 probability there is that a crack will open up be- 

 tween the filling and the wood. If the briquettes 

 at the side are tightly nailed to the wood, when 

 the tree sways the enlargement of the mouth of 



Arrangement of briquettes in an oval 

 cavity 



the cavity will be taken up by the elasticity of the 

 briquette wall. If none of the briquettes is nailed 

 to the wood, a crack may appear, under certain 

 circumstances, along the edge of the filling. 



In carrying up the wall it is well to keep its face 

 as smooth as possible, particularly at the sides, but 

 it is not difficult to smooth the surface with a ham- 



