THE  AMERICAN 
JOURNAL  OF  PHARMACY. 
MARCH,  188Jp. 
LABORATORY  CONTRIBUTIONS  FROM  THE  COURSE 
PREPARATORY  TO  MEDICINE  IN  THE  UNI- 
VERSITY OF  PENNSYLVANIA. 
By  Prof.  J.  T.  Rothrock,  M.  D. 
Read  at  the  Pharmaceutical  Meeting,  January  15,  1884. 
Mr.  Thomas  Ridgway  Barker,  in  examining  the  ordinary  liquorice 
root  (Glycyrrhka  glabra)  finds  imbedded  in  parenchyma  and  in  wood, 
bundles  of  bast  fibres.  These  bundles  have  what  may  be  called  a 
bundle  sheath  in  which  are  found  crystals  of  calcium  oxalate,  shown 
to  be  such  by  the  ordinary  tests. 
Figure  1  shows  the  bundle  in  the  parenchyma,  seen  in  cross  section. 
Fig.  2. 
Figure  2  gives  a  longitudinal  view  of  the  same,  divested  of  its  sur- 
rounding parenchyma.    Figures  are  magnified  about  350  diameters. 
Such  crystals  and  crystal  sheaths  are  not  unique.  They  are  found 
in  the  Aspidosperma  Quebracho,  for  which  see  the  essay  by  Dr.  Adolph 
Hansen,  reprinted  in  the  "  Therapeutic  Gazette,"  October,  1880,  p.  292, 
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