THE ROTTEN HEART 



87 



shows where the mischief began. The stump on 

 tlif ( >tlier log is not yet closed in, and its end is 

 decayed; and a colored streak (c) running down 

 the heart of the old limb shows the trouble that 

 is coining. 



A hickory stub has been covered (Fig. 79), and, 

 from outside appearances, the tree is now safe; 



Disease in ash trunks. 



but a section (Fig. 80) shows that decay began 

 before the healing was complete, and the injury 

 is already serious. Even in the apple stub in 

 Fig. 7-"). wound -rot is serious. The rougher the 

 surface of the wound, the greater is the likeli- 



