PLANTING AND CARE OF TREES 



141 



sterilized^ however, and the opening covered with zinc as described, 

 for large wounds made by pruning. 



In slender cavities where there is a small opening, it is necessary 

 to make some additional holes through the living bark and wood to 

 facilitate the work of cleaning (see fig. 64), and it is often neces- 

 sary to enlarge the opening to give more room for working. In 

 such cases it is also necessary to make up the cement mixture in 

 a semi-liquid form, so that it will flow into all crevices. 



Pig. 64, A well- 

 fiUed cavity showing 

 the three holes that 

 were made through 

 the Hving bark to fa- 

 cilitate the work of 

 cleaning out and af- 

 terward filled with 

 concrete. 



Pig-. 65. This kind of cavity work 

 does not detract from the appear- 

 ance of the tree and is a permanent 

 improvement. Observe that the 



cement is molded to form a convex 

 surface. 



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