HEALING OF GRAFT WOUNDS, 127 



grafts, the surfaces should be covered with wax every year 

 until they are closed in by the new tissue. In most in- 

 stances, the wax will loosen during the first season, and 

 sometimes it falls off. 



The character of the healing process is well depicted in 

 Figs. 131, 132, 133. In Fig. 131 is shown a yearling graft of 

 apple. The strip of wax along the side of the cleft is seen 

 to have split with the enlargement of the branch, and the 

 cleft has filled up with tissue and is now safe from infection 

 of disease or 

 rot. The roll 

 of healing tis- 

 sue upon the j 

 end of the > 



'^m, m ^m 



131. Cleft- 



tissue has not 

 yet covered 

 up the cleft 

 across the end of the 

 stub, and this cleft, if ex- 

 posed to the weather, is a 

 fertile place for the start- 

 ing of decay, for it does not unite 

 except along the sides of the stub 

 beneath the bark. When this stub is 

 split through, following the cleft, we may readily distinguish 

 the location of the healing tissues, Fig. 132. The ends of 

 the cions are at E, and they are now simply inactive and 

 nearly lifeless bits of wood. The new or healing tissue has 

 been built up on the outward side of the cions. On the left, 

 this deposition of new tissue may be traced as far down as 

 H, whilst it is thick and heavy at E and above. The whole 

 interior portion of the stub, represented by the dark shad- 

 ing, is dead tissue, which will soon begin a rapid process of 



