Am.  Jour.  Pharm. 
November,  1894. 
Structure  of  Geranium  Maculatum. 
521 
cleared  by  treatment  with  strong  carbolic  acid  solution,  which 
renders  the  starch  grains  transparent,  the  tannin  cells  may  easily  be 
distinguished  from  the  ordinary  parenchyma  cells  by  the  abundance 
of  their  finely  granular  contents.  The  tannin  seems  to  be  deposited 
both  in  the  interior  of  the  cell  and  in  the  cell  wall. 
The  xylem  portion  of  the  vasal  bundles  is  made  up  chiefly  of 
small-sized  scalariform  tracheids  and  parenchymatous  elements. 
Fig.  5. 
A  cross-section  of  a  root  usually  shows  a  diarch  radial  bundle, 
and  although  the  root  early  undergoes  secondary  changes,  the 
diarch  character  of  the  bundle  remains  easily  recognizable,  and  the 
structure  appears  quite  characteristic.  This  is  shown  by. an  inspec- 
tion of  the  drawing,  Fig.  j,  in  which  d  represents  one  of  the  pri- 
mary xylem  rays,  c  one  of  the  primary  phloem  masses,  and  e  and  f 
