PLATE 5 
A. --Cross section of the cortex of a good inbred strain, the same as shown in Plate 4, 
A. The cells are thick walled and are closely bound together, which gives the cells 
an angular shape in cross section. Many of the comers are reinforced by special 
thickenings. 
B. —Cross section of the cortex of an inbred strain which is susceptible to rootrot, the 
same as shown in Plate 4, B. The cells are not as thick walled as those above; they are 
round in cross section, and are not closely bound together. 
