a THE PARASITISM OF BOTRYTIS CINEREA 431 
The cellulose enzyme calls fur especial mention on account 
ithe prominence which has been given toit. Itappears to the 
‘that the discrepancy between the results of Marshall Ward 
nd those of Behrens, Nordhausen, and himself in this respect 
to be explained by the varying composition of the substance 
oadly called cellulose, and the varying ability of fungi to dis- 
dlve this substance. In all cases it appears that the more easily 
affected forms, the hemi-celluloses and pektoses, forming the 
middle lamellae, etc., were dissolved. That the fungus studied 
the writer is able to affect, to some extent, true cellulose, is 
dent from the cultures on filter paper ; but in the case 
bed by Ward, and also that by Potter, where a strot 3 
swelling of the cell wall was produced, the most rational exp! 
ation seems to be that an entirely different — was present 
N eneral sub- 
