59i 
Balls. — Temperature and Growth. 
with water, so as to wash away the body i x 1 before it had time to 
accumulate in such amount as to inhibit the growth of the fungus through 
the cells of the host. This can actually be done by placing the seedling 
in the bottom of a Petri dish and adding enough water to submerge all but 
the upper third of the horizontal stem. If it is then inoculated, and left 
for a day at as high a temperature as 35 0 C., the following appearances 
are observed. 
Under water: No infection, because aeration is insufficient. 
In the air: Slight superficial brown scar. 
On the water-level : Deep brown rotten patch, which follows the line 
of equilibrium between the two former conditions. 
