PLATE 7 
Views of portions of a diseased com plant, showing effect of accumulations of alumi¬ 
num and iron. 
A. —A barren stalk which grew in a hill adjacent to the normal stalk shown in 
Plate 8, A. The stalk was stripped of its leaves while in the field and then cut longi¬ 
tudinally to be tested for the distribution of the aluminum and iron compounds. 
B. —The basal tissues reacted strongly for aluminum and iron compounds. The 
tissues were dry and badly disintegrated. 
C. —The largest accumulations of aluminum and iron compounds are in the lowest 
nodal plates. This condition and that shown in B are characteristic of many stalks 
which become rootrotted by the latter part of the growing season. 
