PLATE 7 
A. —Two elongated nuclei from cells of procambium. 
B. —Typical nucleus of immature vascular cell. 
C. —Typical nucleus of the apical meristem. 
D. —Elongated nucleus in prophase. 
E. —Corkscrewlike body of young sieve tube. 
F. —Large aggregate of sieve-tube bodies. 
G. —Immature sieve tube with nucleus and sieve-tube body. 
H. —Sieve-tube body showing differential staining reaction. Body is in appearance 
and structure not unlike certain Protozoa. 
