Fig.  i. — Cross-section  of  Canaigre  Root, 
x  s}4  diameters. 
Fig.  2.— Cross-section  of  Chinese  Rhubarb, 
x  5)4  diameters. 
Fig.  3. — Cross-section  of  Rheum  Rhaponticum. 
x  5)4  diameters. 
