210 , 
A 
tt 
AN 
A 
i aA 
A 
i i 
* u Bs tnd wh 
Fic. 30. A portion of the tree shown on the left in fig. 29. The point of in- 
fection is shown at a, the area killed last year at 4, and the development of the fungus 
by May 15 of this year, when the girdling was complete, at c. Between May 15 and 
August 27 the fungus covered the area above and below the point of infection repre- 
sented by d, a lineal distance of nearly ten inches, the progress comneatd being 
opposed by living tissue. 
