8o  Solatium  Carolinense.  {^i^lm^ 
resembles  that  of  the  root.,  except  that  a  part  of  the  epidermis  is 
present.  Collenchyma  is  found  in  the  younger  parts  of  the  stem, 
though  absent  from  the  older  portions.    No  bast-fibres  were  found. 
Fig.  5,  longitudinal-radial  section,  made  from  a  young  root  of  Solanum 
Carolinense  having  a  thick  cortex,  magnified  35  diameters.  A,  cork  tissue ; 
b,  b\  secretion  cells  of  calcium  oxalate  ;  c,  the  cambium,  with  the  ducts  of  the 
xylem  on  one  side  and  the  phloem  tissue  on  the  other. 
