GRAFTING AND NURSERIES. 



231 



to a node and starting from the same level; they intersect 

 exactly on the axis of the cane (Fig. 105). The scion pre- 

 pared in this way is introduced in the slit of the stock, kept 

 open by the point of the grafting knife (Fig. 107). 



Canes are not generally cylindrical, but more or less 

 flattened. Consequently, stock and scion must be cut in a 

 wedge-like shape or split along the larger diameter. It is 



Fig. 107. Fig. 108. 



English Cleft-Graft Showing the disposition 

 Stock and Scion of generative layers 



joined. on Stock and Scion. 



Figs. iog and no. 



Shouldered Cleft-Graft 



prepared with 



grafting-knife. 



in fact along this diameter that the canes have developed 

 most, it is there that the generative layers are most active, 

 and, consequently, that knitting takes place most perfectly. 

 As already pointed out, the zones along which knitting 

 takes place must be in perfect juxtaposition ; they are 

 parallel on the stock, they should, therefore, be parallel on 

 the scion. But the generative layers of a scion-cut wedge 

 are disposed (Fig. 108) according to' a parabola A, B, C; 



