EXERCISE XXXVI 



THE STUDY OF BRIDGE GRAFTING 



Material. Stocks of the apple, three inches in diameter and 

 twelve inches in length, scions from the same kind of trees. 



Apparatus. Sharp knife, 

 grafting-wax. 



Bridge grafting is used 

 to save girdled trees and for 

 the healing over of wounds 

 that have been made by 

 cultivating-implements. 



The wounded part is 

 first thoroughly cleaned 

 out (Fig. 34, A) and the 

 bark cut back until it is 

 smooth. The scions are 

 cut wedge-shaped at both 

 ends (Fig. 34, B) and vary- 

 ing in length according to 

 the size of the wounded 

 area, and are then pushed 

 up firmly under the bark. 

 They should be about an 

 inch longer than the wound. 

 From three to six scions 

 are used, according to the 

 size of the wound. 



1. Make a drawing, two inches in diameter, showing the injury 

 to the limb. Show by dotted lines the position of the cut which 

 must be made in order to smooth up the edges. Why is it 

 important to cut this bruised tissue back to firm bark ? Discuss. 



2. Make another drawing, the same size as the above, showing 

 the scions set in place and the whole surface waxed over. Label 

 and describe. 



Make a drawing of a scion. How many buds are found ? 



[126] 



FIG. 34. Bridge grafting 



A, stock, showing scions in position ready for 

 waxing ; B, scion, showing wedge at each end 



