156 
Journal of Agricultural Research 
Vol. VIII, No. 4 
evident start on apples at 5 0 after two w r eeks, but grew on corn-meal agar 
at o° from the first. Sphaeropsis malorum , however, showed the same 
slowness in starting on corn-meal agar at low temperatures that it had 
Fig. 14.—Graph showing the growth of Al~ 
ternafia sp. on com-meal agar in petri 
dishes. 
Fig. 15.—Graph showing the growth of 
Botrytis cinerea on corn-meal agar in petri 
dishes. 
on apples and, contrary to the fungi already mentioned, it grew at a 
lower temperature on apples than on the agar. The above contrasts 
show that with nearly all of the fungi studied the period of incubation 
Fig. 16.—Graph showing the growth of Cephalothe- Fig. 17.—Graph showing the growth of Fusarium 
cium roseum on com-meal agar in petri dishes. radicicola on com-meal agar in petri dishes. 
that was pointed out as important in the experiments with apples has 
much less significance when the same fungi are grown on com-meal agar. 
The contrast between the growth on apples and that on agar at low 
temperatures becomes still more striking when we consider that in the 
