206 VEGETABLE PHYSIOLOGY 



in the stem of another nearly related one, and the two are 

 closely bound together. The graft or scion comes into such 

 close connection with the stem or stock that the food which 

 is contained in the cells of the latter passes into the tissues 

 of the graft, which thus receive their nourishment. After 

 a longer or shorter time the two become so completely united 

 that they live subsequently as a single organism, and the 

 processes of carbohydrate and protein construction proceed 

 as in a normal plant. 



