444 BOARD OF AGRICULTURE. 



1. Healthy wood shows comparatively little stored starch; but 

 fungous growth is present in the outer layers of the bark. 



2. Diseased wood shows an abnormally small development of the 

 cells, and the invariable presence of large quantities of starch ; also an 

 abundance of fungous growth. 



3. Diseased leaves show the presence of fungous gi'owth, discolora- 

 tion, and cells filled with starch. 



4. The fungus appears first on the surface of the trunk or branches, 

 and thence enters the woody structure when the conditions are favorable. 



5. There is little or no difference between the tissues and cell con- 

 tents before and after the leaves fall. 



6. While fungus is abundant on fully diseased trees, it is also to be 

 found on trees which, onct diseased, had been restored to a cojidition of 

 vigorous health. 



The previous statements seem to confirm some of the 

 views entertained by me when planning the investigation. 

 The results seem to point towards an interior disorder be- 

 fore the fungus enters the liviug tissue. 



Whether some other internal or external influence, or 

 both, inaugurates the disease, whether the various forms of 

 the disease are merely a matter of degree, or whether they 

 are of an entirely different character, must, of course, be 

 left to future investigation. I consider my results of a gen- 

 eral interest rather on account of what they suggest than of 

 what they seem to prove. 



