PLATE 90 
Plates 90 to 93, showing plants from experiment 5, representing the type and the 
degree of injury to Irish Cobbler potato stems which occurred in sclerotia-inoculated 
soil (unsterilized) held at constant temperatures ranging from 9 0 to 30° C., as specified 
in the respective legends. 
A. —Plant grown at a soil temperature of 9 0 C. Twenty-seven per cent of the grow¬ 
ing points were destroyed at this temperature. 
B. —Plant grown at a soil temperature of 12 °. Forty-seven per cent of the growing 
points of the plants held at this temperature were destroyed. Greater tissue destruc¬ 
tion also occurred than at 9 0 . 
