FIG. 46. Portions of oaks, thirty-five years old, attacked by A. Taleola ; two thirds 

 natural size. No. I has been attacked for one to two years, and still shows some 

 sound patches, as at a a. Numerous stromata are visible on the dead cortex. No. 2 

 has been suffering from the disease for four years. In the upper portion a canker- 

 spot will be seen which is still unhealed, while below another is shown which is 

 nearly closed. No. 3 represents a cross section showing three canker-spots, five, 

 sight, and ten years old respectively. 



