Senate Document No. 653, 62-2, 
PLATE [. 
AT 
He 
Ht 
1 
G 
a aay p 
raul is B 
=! 
£ 
=z 
z eae & 
oe 
f 
sae mere 2 
—— z 
x 
. 
. 
. : 
ae 
Me x rc 0 
[Horizontal lines show the botanical distribution of the American chestnut tree. Dots repre- 
sent advance infections. i 
show various degrees of general infection and death.] 
KNOWN DISTRIBUTION OF THE CHESTNUT BARK DISEASE FEBRUARY 1, 1912. 
Thicker lines, arranged concentrically about New York City, 
