vi.] DISEASES DUE TO CERTAIN PARASITES. 175 



surrounding cambium to cover them up, as it will 

 naturally do, the term of life of many a valuable tree 

 can be prolonged, and its timber not only prevented 

 from becoming diseased and deteriorating, but actually 

 increased in value. 



In the next chapter I propose to deal with the so- 

 called "dry-rot" in timber which has been felled 

 and cut up a disease which has produced much 

 distress at various times and in various countries. 



