PLATE NO. I. 



Chestnut branch showing- atrophy 

 caused by the chestnut bark dis- 

 ease; also wound in which infec- 

 tion probably started and con- 

 centric lines of advance of the 

 fungus. 



Chestnut branch showing- hyper- 

 trophy and longitudinal splitting 

 of bark caused by the chestnut 

 bark disease. 



