602 BULLETIN 347 
and fifty-six. On reinspection, twenty-eight out of the forty-two spots 
showed no recurrence of the blight; in three cases a single new infection 
was found, and in six cases there were two recently infected trees. The 
highest number of new infections numbered thirteen trees. In the 
forty-two spots aver- 
aging 13.25 original 
infected trees each, 
one hundred and fifty- 
six reinfections 
occurred, or 3.7 
infections per spot. 
In two thirds of the 
forty-two spots no 
blight reappeared, and 
the new _ infections 
which developed in the 
remainder equaled 
only two sevenths 
of the number of 
trees originally diseas- 
ed. These spots were 
located in the region 
of very slight in- 
fection in Elk, Clear- 
field, Center, and 
Fulton counties.” 
The results of the 
oldest experiment that 
is reported are as 
follows (pages 32-33 
of the same report): 
“In order to get 
information concern- 
ing the effectiveness of 
two different methods 
Fic. 99.— Cutting down the tree that has been peeled at the base of cutting out diseas- 
ed chestnut, a stump- 
to-stump count of too stumps each was made in November, 10912, 
on two different tracts located at Haverford. In one of the woodlots 
the infected trees were cut in the fall of 1910, and the stumps peeled, 
and all brush destroyed by burning, but the burning was not done 
over the stumps. On this tract a hundred stumps had 1354 vigorous 
