8o6 



a part of the bark has been left standing in the loose strips / and / . New 

 wood with bark (nh) has been formed in places on these strips at a little 

 distance from the place of their attachment. The real exposed surface of 

 the trunk has been cut off from all connection with the overgrowth edges 

 u,u', because at i and i' the young wood, as already mentioned, had been 

 scraped off all around the trunk, in this manner forming an isolating band. 

 The new formation of bark "elements with the beginnings of wood had 

 started on the exposed surface, cut off from all connection with the bark 

 and sapwood layers. These new structures do not form a connected mantle 

 but consist of isolated groups. On other, more carefully barked trunks. 





Fig. 15 



Cross-section through a newly produced tissue outgrowth on the exposed 

 wood of the barked sweet cheriy trunk. 



the new bark extends perfectly uniformly over the bared surface. In the 

 middle of this surface an irregular zone of exposed wood has remained 

 without any new formation. Therefore, the new product (b) is not con- 

 nected with the upper one (a), which is considerably thicker. Common to 

 both and just as clearly recognizable in all new structures on other trunks 

 is the thickening which increases from above downward in each individual 

 tissue strip and in its appearance resembles perfectly the phenomenon 

 produced by the drippings of a badly burning candle. In fact, the lower 

 end of the new structure, resembling the callus, is poured in the form of 

 drops over the parts of the wood which have remained naked (ee). On 



