Am.  Jour.  Pharm.  1 
March,  1895.  / 
Structure  of  Cimicifuga. 
125 
new  ducts  until  the  bases  of  some  of  the  adjacent  rays  appear  to 
coalesce.  The  phloem  masses  have  also  increased  considerably  in 
size  by  new  growths  on  their  inner  face.  Finally,  in  Fig.  7,  a  sec- 
tion of  the  old  or  mature  portion  of  the  bundle  is  shown.  In  this 
the  bundle  is  observed  to  be  enormously  increased  in  size,  and  most 
conspicuous  among  the  structural  changes  observed  are  the  forma- 
tion between  each  pair  of  primary  xylem  rays  and  back  of  each 
phloem  mass  a  large  xylem  wedge,  so  that  the  xylem  elements  in 
their  arrangement  now  present  the  form  of  a  Maltese  cross.  Alter- 
nating with  the  arms  of  this  cross  are  four  broadly-wedge-shaped 
medullary  rays  (also  secondary  formations),  the  thin  inner  end  of 
each  wedge  resting  upon  one  of  the  original  xylem  rays,  as  shown 
at /  in  the  figure. 
