X(>. ;^>."(. Distrilnitioii of llie eliostnut n-irk disease. Horizontal lines indicate 

 apiiroxiniate distributiim of uninfected oliestuut : dots indicate isolated infected 

 spots ; the heavier lines in various directions indicate varying degrees of infection 

 culminating in an area about New Yoi'k City in which all chestnut trees are dead. 



