426 BOTANICAL GAZETTE [JUNE 
experiments a medium was made up by adding 28" of commer- 
cial cornstarch to each 98° of the stock solution. The starch did 
not dissolve to any great extent, but formed a paste. Inoculated 
with Botrytis only a very feeble growth resulted. From this it 
seems that this species has not sufficient power of hydrolizing 
starch into a form of sugar in which it could be assimilated to. 
provide for its full development. It was found, however, that in 
a very dilute starch solution hydrolysis could be brought about 
by adding an extract of the Botrytis mycelium, as shown by the 
iodine test. From this it appears that the fungus secretes at 
_ least a small amount of diastase. 
_ Dextrose (glucose, grape sugar).— A 3 per cent. solution of 
this substance in the stock solution was used as a culture medium. 
_ Growth’ was rapid, and development luxuriant, as was to be 
| degue 
te ite —A solution containing this substance was made 
oe case. roth was at first slow, so that at the ens 
~ 
f, Oo : the ee eacat became more vigorous, ad the 
final resu was. as good as any. This course of development 2 
Bae = per that it was first necessary to invert piers 
