Fig.  7,  transverse  section  of  a  younger  portion  of  a  petiole  of  Solanum  Caro- 
linense.    Magnification,  65  diameters,    a,  epidermis  ;  b,  collenchyma  tissue ; 
c,  c',  large  secretion  reservoirs  ;  d,  d' upper  and  lower  phloem  tissues,  respec 
tively  ;  ey  xylem  ;  f,  meristem,  found  only  on  the  lower  side  ;  gy  stellate  hair. 
