114 



JOURNAL OF THE 



[October, 



tacked as in the White Cedar. The mycelium, however, of its 

 special fungus, Lentinus lepideus, is frequently found in the over- 

 grown stubs, and, when the wood is used for ties, it revives and 

 fruits. It is very destructive to the wood, when the latter is 

 used in contact with the soil ; the resin in the wood furnishing 

 little resistance to its ravages. 



Fig. 4. 



The growing trees of Yellow Pine protect the duramen of their 

 trunks from its destruction, by closing up their wounds, shutting 

 off the air supply and breaking the combination of conditions 

 essential to its growth. 



From these illustrations a very practical lesson is to be learned, 

 and that is, in pruning trees, we ought to follow nature and pro- 

 tect the wounds, otherwise, if the tree cannot do it, the fungi 

 will attack, and injure the tree. 



