375 
Marshall Ward . — On a lily -disease. 
evidence is all but conclusive that the changes are due to the 
ferment referred to. Considerable success was obtained towards 
obtaining the ferment pure, by precipitation from the extracts 
with alcohol. In conclusion of this part of the paper I 
describe the phenomena of infection, and the details of the 
parasitism of the fungus, discussing the reasons for the disease 
being at one time sporadic, and at another epidemic, in its 
attacks. 
The second part of the paper is occupied with the question 
of nomenclature, and the systematic position of the fungus, 
and I have given what seem to me very strong reasons for 
concluding that the fungus is a so-called Botrytis of the 
Polyactis- type— -a gonidial form of some sclerotium-bearing 
Peziza. Further, that while it is certainly distinct from 
Polyactis vulgaris , Botrytis cinerea , and other accepted forms, 
it may or may not be the gonidial form of a Peziza which 
has been already described. This can only be decided when 
the sclerotia and peziza - cups are found. Its mycelium 
presents several resemblances in its physiology to that of 
Sclerotinia ( Peziza ) Sclerotiorum , but such important differ- 
ences occur in other respects that it must be unhesitatingly 
kept separate. In this part of the paper the literature is given 
so far as it applies, and guidance to the complete literature of 
the whole subject indicated. In conclusion some remarks of 
a hypothetical nature are offered, suggesting that the Pezizas 
of the Sclerotinia-g roup and their allies are in a transition 
state from saprophytes to parasites, and that the form now 
studied is one which has succeeded in becoming a true 
parasite. 
