14G BOTRYTIS OF POTATO. 



disease was caused by this fungus would be 

 contrary to the best evidence, but that it 

 attends and accelerates it is unquestionable. 

 True it is that whole fields, in a sad con- 

 dition of disease, were seen without a trace 

 of botrytis ; but in all contagion, infection, 

 and inoculation, anomalies constantly occur. 

 In most cases, the botrytis was certainly con- 

 nected with the disease, and a description of its 

 growth will be interesting to every reader. 

 The threads of mycelium interwove them- 

 selves amongst the cellular tissue. They ran 

 through the loose intercellular passages of the 

 lower surface of the leaf with great ease, and 

 the fungi emerged through the stomata. 

 Drawings of these modes of growth will be 

 found in Mr. Berkeley's paper, in the first 

 volume of the Journal of the London Horti- 

 cultural Society. They admirably illustrate 

 the progress of this curious fungus, the my- 

 celium of which was undoubtedly present in 

 the potato plants. It is a remarkable circum- 

 stance, however, that this botrytis was found 

 to grow with greater luxuriance on the diseased 

 tubers, where the tissue is far more dense, 

 than in the stems or leaves. That the myce- 

 lium of this fungus was contained in the 



