A.—Cross section through peripheral region of mature internode. Beneath the epidermis are 
several layers of lignifled cells, and beneath these are two or three layers of thin-walled paren- 
chyma. For a longitudinal section through this region see text figure 2. X188. 
B .—Cross section through outer stem and leafsheath at the point of the insertion of the latter on the 
stem X19. 
c. —-Cross section of the sheath at the insertion point of the ligule. The section appears broad 
since it is taken through the central part of the sheath and not the flanges. X24. 
D.—Cross section through the sheath-joint. X24. 
E—Cross section through leafsheath midway between the sheath-joint and the blade joint. X24. 
