GRAFTAGE GENERAL CONSIDERATIONS 



139 



jorted by photographic cross sections of both grafted 

 md budded stems (Fig. 116). In e\-er3' case the line 

 )f demarcation between stock and cion and also the 

 ;ontinuous envelopes of new tissue may be clearh- seen. 

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

 ;hey 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. 



:erm; each is complete and continuous. 3. In hardwood 

 jraftage "union" of stock and cion is difterent in its 

 physical nature from the sense of common speech. 



These simple obvious conclusions suggest questions . 

 ind doubts which do nmch to disguise the main facts. 

 Tor instance, the horticulturist knows that when a pear 

 :ion is grafted on a quince stock, every bud above the 

 inion w'll produce pears and every one below, quinces. 



But there is a di\'ision (and there must be) between 



