560 
Powdered  Vegetable  Drugs. 
f  Am.  Jour.  Pharm. 
X  November,  1898. 
217.  Tr.  Rhei  Dulcis. — Characteristic  aleuron,  non-secreting  hairs 
and  secretion  reservoirs  of  anise ;  seed  coat  and  crystals  of  carda- 
mom, crystals  in  crystal  fibres  of  glycyrrhiza ;  crystals  and  starch 
of  rheum. 
219.  Rhamnus  Purshiana. — Rosette-shaped  and  cubical  crystals; 
bast  fibres  (more  numerous  than  in  Frangula) ;  stone  cells  (which 
are  absent  in  Frangula) ;  a  few  milligrammes  of  powder  boiled  with 
water,  filtered  and  the  straw-colored  filtrate,  treated  with  KOH, 
gives  a  red  color. 
Crystals  cubical \  tetragonal  or  coffin-shaped  and  numerous. 
220.  Calumba. — Stone  cells  contain  tetragonal  crystals;  starch 
grains.    (See  No.  24.) 
221.  Glycyrrhiza  (Russian). — Numerous  sklerenchyma  fibres,  ad- 
joining which  are  crystal  fibres  containing  tetragonal  and  coffin- 
shaped  crystals ;  few  cork  cells,  distinguishing  it  from  Spanish 
(which  see,  No.  275);  some  parenchyma  cells  contain  glycyrrhizin, 
and  are  colored  straw-yellow  with  H2S04. 
JSfeedle-shaped  crystals. 
222.  Angustura. — Stone  cells;  bast  fibres;  long  yellow  secretion 
reservoirs ;  yellowish  (oil)  and  reddish-brown  (resin)  masses. 
II.   FEW  OR  NO  FRAGMENTS  OF  VEGETABLE  TISSUES. 
A.  BURN,  GIVING  OFF  ODOR  OF  S02. 
223.  Sulphur  Lotum. — Small  rounded  masses  in  chains. 
224.  Sulphur  PrcEcipitatum. — Small  rounded  masses  in  irregular 
groups  in  glycerin  mounts. 
B.  ON  BURNING  DO  NOT  GIVE  OFF  ODOR  OF  S02. 
{a)  Nearly  colorless  in  glycerin  mount. 
225.  Mastic. — Transparent  irregular  masses. 
(U)  Yellowish  in  glycerin  mount. 
(«)  Containing  oil  globides. 
226.  Scammonium. 
[3.  Transparent  or  translucent. 
227.  Resina. — Irregular  masses,  soluble  in  cold  alcohol  (95  per 
cent.),  forming  a  straw-colored  liquid,  becoming  milky-white  on 
addition  of  water ;  on  heating  fragments  of  resin  in  water,  they 
melt,  run  together  and  form  a  sticky  mass. 
228.  Sandarac. — Almost  insoluble  in  alcohol  (95  per  cent.),  and 
