PLATE 44. EXAMPLES OF TREE-SURGERY. 



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a 



Cavity in a tree cleaned ready for a coating of coal-tar and filling. 2. The cavity filled, 

 showing the cement depressed a distance equal to the thickness of the bark. 3. The 

 same treethree years later, callus overgrowing filling. 4. Before the filling was done in 

 this example, a narrow strip of bark was cut around the periphery of the opening and 

 the filling then brought up flush with the wood. 5. The same a year later. The healing 

 callus is beginning to roll over the wood. 6. Injury caused by banding a crotch. 7. 

 Large knot-hole in trunk of white maple, showing ring of tissue around opening. 8. 

 Side view of the same. A cut is made along the line A B. 9. The decayed wood is re- 

 moved and cavity filled flush with saw-cut. Callus is beginning to overgrow the wound. 



