GENERAL METHODS 



127 





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Beech tree with old trunk cavity and the same tree, excavated, 

 braced, and filled with asphalt 



through the center of the tree, only one end being 

 near the edge of the cavity. The same method 

 is advisable when the wood on either side of the 

 cavity is very thin. After the location of the bolts 

 is decided on, the holes for them should be bored, 



