GRAFTAGE GENERAL CONSIDERATIONS 139 



ported by photographic cross sections of both grafted 

 and budded stems (Fig. 116). In every case the line 

 of demarcation between stock and cion and also the 

 continuous envelopes of new tissue may be clearly seen. 

 Thus it is evident that : 1. Stock and cion do not unite ; 

 they remain distinct. 2. Annual layers produced after 

 grafting do not unite in the common meaning of that 



FIG. 123 PLUM GRAFTS SHOWING CONTINUOUS LAYERS OF NEW WOOD 

 The old wood in the specimen on the right has been partly eaten out by ants. 



term; each is complete and continuous. 3. In hardwood 

 graftage "union" of stock and cion is different in its 

 physical nature from the sense of common speech. 



These simple obvious conclusions suggest questions 

 and doubts which do much to disguise the main facts. 

 For instance, the horticulturist knows that when a pear 

 cion is grafted on a quince stock, every bud above the 

 union will produce pears and every one below, quinces. 



But there is a division (and there must be) between 



