THE USE OF SHOOTS EOE PEOPAGATING 191 



the young wood (nh) and also the pith have taken part in 

 the healing of the wound. The latter has, for instance, formed 



re ec ^Pjpf 



Fig. 29.— Section of a Gkaft op a Two- Year-Old Twia op the Lime (rflm Suroptea). 



The scion (P/) has been pushed into the pith of the wild stock. The arrows indicate 



the direction in which callus layers have grown to close up the wound. 



(The explanation of the lettering will be found in the letterpress). 



the tissue (md'), which has joined up with that formed by the 

 cortex (to"). That part of the split (sp) which was not filled 



