3G4 
On the Potato Disease. 
botrytis infestans as not to be distinguished from it by the highest 
power of an 07Y??«ar«/ microscope (I mean that called Dr. Hooker's), 
will grow on very opposite substances, and that they grow larger 
on decaying matter than on the living plant, on which they did 
not extend beyond the injured part of the leaf. 
B. 
1. 
On deail potato stalk, smoky-yellow and black. — J. C, Feb. 1846. 
2, 
Smoky-yellow and black. 
Creamy White. 
Peziza tencrtima. 
4. 
From blotch cn slioot from diseased potato. April 3, lii46. 
All tliese plants on l-'th of an inch by 1-lCtli of an inch. 
Hotrytis infestans? 
Fioni these circumstances, and from the fact that I have never 
yet seen the mildew on a healthy leaf, I cannot entertain tlie 
