No. 28. The chestnut tree in the centre of the picture shows four well-developed 

 le.sions. — I'liotogrupli hy Prof. Collins. 



No. 20. Typical group of dead chestnut trees. Note dead suckers on the trunks. 

 From left to right: — the first trunk shows the disease less than one year old, 

 (nothnig evident in this i)l!Oioginph) ; the second, an infection of from two to three 

 years old ; the third four or more years old ; and the fourth about three years old. 

 Scene near Brooklyn, New York. — /'hotoyraph hy Prof. Collins. 



