RESISTANT VINEYARDS GRAFTING, PLANTING, CULTIVATION. 123 



and are growing at the expense of the food material stored up in 

 the scion. As soon as roots are formed the shoots become a deeper 



FIG. 22. Effect of failure to remove^scion roots. 



green and are then obtaining food from the roots and from the air. 

 By this time the unions are well formed, and the scions being supplied 

 with water by their own roots and by those of the stock are in less 



