120 PRACTICAL TREE REPAIR 



way, but when the need of them can be clearly 

 foreseen, it is an economy to cut them at once, so 

 that each portion of decayed wood can be removed 

 from the most convenient point. If the decay 



Vertical section of a decayed oak, showing holes bored to de- 

 termine extent of decay, and section of the same tree excavated 

 and filled 



runs down the trunk to the ground on any side, 

 the soil must be dug away. It may be well to 

 mention here that cavity work is very hard on the 

 grass around the tree, and it is often well to lay 

 down a piece of canvas or burlap, to protect the 

 sod. Existing openings must in every case be 



