484 [ THE VINE. 



Green grafting may be performed also following 

 the method of the English whip or tongue graft, but the 

 operation is so delicate that it cannot be recommended 

 except to very skilled operators. In the method of green 

 grafting by copulation or approximation the scion has also 

 two buds, of which the lower is cut across the node on one 

 side in a slanting direction thus giving an elongated oval 

 section which is applied to a similar section made on the 

 side of one of the upper nodes along the green stem of the 

 subject, which is trimmed back to about 4 c.m. above 

 this node. 



The influence of the stock on the scion, and that of 

 the scion on the stock, as well as that of the graft on 

 plant itself and on the quantity and quality of the pro- 

 duce, has given occasion to long and lively debates, but 

 the result of experience may be summed up as follows : 



i). The stock imparts soms of its vigour and 

 resistance to the scion, however without any alteration in 

 the specific quality of either the stock or the scion, hence 

 given equal conditions a vine grafted on a vigorous stock 

 is more vigorous than one growing on own roots. 



2). The scion of a weak variety or species is a 

 source of weakness to the stock on which it is grafted, 

 that is the stock loses some of its natural vigour and 

 resistance if grafted with a weak species or variety, and 

 viceversa acquires in vigour or resistance if grafted with 

 a species or variety more vigorous and resistant than 

 itself. In practice the influence of the scion on the stock 

 is usually small and negligible, but is always present 

 to some extent, and accordingly an American or hybrid 

 American vine which dislikes a calcareous soil may be 

 grafted with advantage on European stock, and this 

 stock becomes more vigorous and is stated to offer some 

 resistance to Phylloxera, whereas it would easily succumb 

 if ungrafted. 



