PLATE 5 
A. —Basal tissues of a stalk taken from the field shown in Plate 15, A. The darkened 
areas are the vascular plate tissues, zone B, in which the iron and aluminum salts 
accumulate. 
B. —A later stage, showing the basal nodal tissues containing heavy deposits of 
the aluminum and iron compounds. The nodal tissues are disintegrated and most 
of the roots have completely rotted. 
C. —Transverse section through kernels on an ear of Stowell Evergreen Sweetcom. 
The kernels vhen tested showed the presence of large quantities of organic iron com¬ 
pounds. Different ears show variable amounts of iron in them. 
