98 



NEW YORK ZOOLOGICAL SOCIETY. 



vation, the field of the disease fails to enlarge appreciably after 

 the flow of sap ceases in the portion above the point of attack. 



A HEALTHY SPECIMEN OE THE CHESTNUT. 

 This is the tree which the foresters are spraying. 



The spore bearers do not appear upon any bark except that which 

 was affected at the time of the death of the member. 



In one case which v/as vmder close observation from the time 

 that the first dry speck appeared until the ringing and killing 



