THE PARASITISM OF BOTRYTIS CINEREA 435 
ectly depends upon a varying power of enzyme formation 
the reserve material of the conidia. The theory advanced 
he present article is easily adapted to the known conditions — 
this respect. The addition of a nutrient solution would at 
once bring about the formation of oxalic acid, poisoning the = 
ib acent tissue and permitting the entrance of the hyphae 
ugh the dead cuticle and epidermis by mechanical force 
‘the influence of chemotropism. That this effect would be 
d by the conditions under which Botrytis attacks living 
needs no explanation; thickness of cuticle and epidermis, 
Without such nourishment the ability of the germ 
to enter the plant depends upon the amount of acid ae 
rom the reserve material in the conidia. In the linden oe 
2 diseases studied by the writer (13) the conidia formed — a 
found to be of unusually large size. Marshall Ward found 
; ae disease, where infection — _ as welll ithos 
+ 
the Eibiary size, and obedveaen: in general show 
Botrytis grows actively and luxuriantly upo 
Are not ieee nts st 
best ibs: wok: upon the paras isn 
fungi too much i aber has 
various = conan ° 
