CHAPTER IX 

 THE VARIOUS TYPES OF CAVITIES 



THIS general description of the procedure to 

 be followed in the filling of cavities with the 

 various materials employed for that purpose must 

 in practice constantly be modified to suit special 

 conditions. In the following pages the com- 

 moner types of cavities 

 will be taken up and the 

 principal measures and 

 materials best suited to 

 the handling of each 

 will be described. 



Rotten knot-holes 

 and decayed stubs con- 

 stitute the common- 

 est type of cavity. 

 Many large and serious 

 cavities have their 

 origin in the stubs re- 

 sulting from the death 

 of limbs or the incor- 

 rect removal or treatment of limbs by pruners. 

 Holes of this kind are extremely common, and it 



159 



Section of rotten stub, with 

 dotted line indicating cor- 

 rect excavation 



