CHE REFERENCE LIBRARY - ZetaTalk

150 THE NURSERY-MANliALthe new tissue. In the meantime, the wound should be prot,cctedb>. a dressing, a, wax or pa,&, to prevent decay. Incleft-grafts, the swfxces should be covered with wax everyyear until they arc closed over by the new tissue. In mostcases the wax will loosen &e first season, a,nd sometimes itThe character of the hea,lingprocess is well depicted in Figs.181, 4w, 183. In Fig. 181 isyearling cleft-graft ofapple. The strip of wax along theside of the cleft is seen to have splitwith the enlargement of t.he branch,and the cleft has filledup with tissue and isnow sa.fe from infectionof disease or rot. Theroll of liea,ling tissue on1 the end of the stub isyear after setting (s 1). seen about the borderof the wound. Thistissue has not >*ttt (*o\wererl the cleft across the end of the stub,and this cleft, if exposed to the weather, is a fertile pla.ce for thestarting of cleca~-, for the cleft does not unite except along thesides of the stub bt~ncath the hark. When this stub is splitlengthwise, following down the cleft, we may readily distinguishthe lor*ation of the healing tissues, Fig. 182. The lowerends (if the vions ;m at T1:, and t.hey are now inactive and nearlylifeless bits of wood. The new or healing tissue has been builtup on the outward side of the c,ions. On the left, this depositionof new tissue may be traced as far down as H, while it is thickant1 heri\-J* at K ant1 above. The whole interior part of the stub,repre~entcri by the dark shading, is dead tissue, which willsoon begin to deca,y unless it is well protected from the weather.