AGRICULTURAL BOTANY 



161 



5. To save injured trees; 



6. To change the size of trees ; 



7. To avoid injury and loss from insects which es- 

 pecially infest some trees. 



Cleft Grafting. - - This method is adapted only to 

 large trees of which it is desired to change the variety. 



Scions in the cleft 



i 

 Scion 



Cleft graft 

 complete 



Position of the scions ; C, cam- 

 bium layer 



FIG. 81. Cleft Grafting. 



A branch of the stock to be grafted from one to one and 

 one half inches in diameter is sawed off, care being taken 

 not to loosen the bark of the stub, which is then split 

 with a chisel or grafting tool. The opening is then 

 spread with a wedge and the scions inserted. These 

 scions should be new growths of the previous season, 



M. & H. AG. II 



