354 Marshall Ward . — On a lily -disease. 
walls swelled up, and became distinctly lamellated and folded 
as in Fig. 60. 
Similar sections, lying for an equal time in the boiled 
solution, gave no such reactions, nor did sections lying in 
water. 
It seems clear, then, that the precipitated flocks carried 
with them a substance which dissolves in water and produces 
the changes in cellulose which have been described ; and I 
think it will not be denied that this substance is the ferment 
so often referred to. As yet, however, I cannot claim to have 
isolated the ferment in a state of absolute purity, though it 
seems probable that this will yet be accomplished. It seems 
extremely probable that the ferment is of the same nature as 
the one extracted by De Bary from carrots which were 
destroyed by the mycelium of Peziza Sclerotiorum. 
Having now obtained a fairly complete history of the 
Botrytis as a saprophyte, we will proceed to describe its 
behaviour as a parasitic fungus. As will have been seen from 
the previous part of the paper, I was led to attempt infections 
on account of the peculiar behaviour of the small spots on the 
leaves and buds, etc. 
During July and August conidia were several times sown 
in drops of distilled water, on the surface of young lily-buds, 
or of leaves, obtained from non-infected plants at a distance 
as well as from specimens nearer the infected area. 
The conidia germinated readily on the epidermis, and in 
from 20 to 48 hours the germ-tubes were usually found in 
the solid cellulose-substance of the cell-walls of the epidermis. 
Looked at from above, as in Figs. 46 and 4 7, it was by no 
means obvious at first that the germ-hyphae had penetrated 
the cuticle ; but closer observation showed that the tips of 
the longer or shorter germ-hyphae attached themselves to the 
surface of the cuticle, and then dissolved their way in, discolour- 
ing and destroying the cell-walls and cuticle in the immediate 
neighbourhood. In no case did I see the end of a germ- 
hypha enter a stoma, though it is by no means denied as 
improbable that such an entrance may occur. It was often 
