Crown grafting i.e. making a space between the bark and the wood for the reception of the pared-down scion, is good, given careful tying; without this the scions would be blown out. First slit the bark, then make the space with a piece of hard wood or bone, withdraw this, and substitute the scion after a sloping cut has been made in it about 1 inch long.
Cleft grafting answers equally well with good workmanship, and tying is hardly needed. In this operation the stump is split to a depth of 1 inch by laying the edge of a strong, heavy blade across the centre and giving a sharp tap with a mallet. The blade is removed, and the cleft held open by inserting a small upright chisel in the centre. A portion of wood is cut out of each edge at both sides so as to form a wedge-shaped space, and the scion is cut to fit it. By slightly depressing the chisel the scion can be got well in, and directly the chisel, is withdrawn the cut pieces come together and hold the graft tight. (Fig. 26.)
A, scion prepared for cleft grafting: a and b, cut surfaces.
B, scion prepared for crown grafting; h, cut sur face; i, shoulder to fit on top of stock; j, outer portion, not cut.
C, cleft grafting: h, stock; i, bark; j, inner wood; k, cleft; l, scions; m, base of scion fitted in stock, inner barks of both in contact.
D, crown grafting; m, stock; n, scions inserted after cutting through the outer bark and separating it from the wood with a bone; o, ligature.
a, handle; b, blade; c, wedge.