Am.  Jour.  Pharm. \  C^M/,  P87 
November,  1896.  /  OenUa.  $0/ 
Careful  measurements  of  the  epidermal  cells  in  the  two  varieties 
give  the  following  results : 
India  senna,  average  .......    35  micromillimetres  in  diameter. 
Alexandria  senna,  average    ....    40  "  "  " 
Fig.  2. — Indian  senna,  about  260  diameters.  a}  ordinary  epidermal^cell ;  n, 
stoma ;  h,  plant  hairs  ;  /,  tracheid  (rarely  found  in  senna). 
Fig.  3- — Chestnut  leaves,  about  260  diameters,  a,  ordinary  epidermal  cell ; 
n,  stoma  ;      pitted  cells  from  mid-rib  ;  t,  tracheids  from  mid-rib. 
Chestnut  Leaves. — The  adulteration  of  senna  with  chestnut  leaves 
in  powdered  form  can  readily  be  detected.  Place  ]/2  gramme  of  the 
No.  60  powder  in  a  layer  of  uniform  thickness  on  a  clean  glass'slide, 
