Am.  Jour.  Pharm.i 
Dec,  18S9.  J 
Analysis  of  Blackberry  Bark. 
605 
ANALYSIS  OF  BLACKBERRY  BARK. 
By  Gustav  Adolf  Kkatjss,  Ph.  G. 
Abstract  from  an  Inaugural  Essay. 
The  results  of  the  any  lysis  of  the  root  bark  of  Rubus  cillosus  are 
given  in  the  following  table : 
Treatment  with 
("Volatile  oil  ..0-015 
Petroleum  ether  -J  Wax  and  bitter  principle  0*015 
(Fixed  oil  0*230 
—   0-26 
C  Gallic  acid  0*370 
Absolute  ether...  \  Resin  soluble  in  alcohol  0*650 
I  Resin  insoluble  in  alcohol  0*050 
Absolute  alcohol 
'Phlobaphene  0*870 
Tannin  6*530 
Extractive  4*100 
Yillosin  0*800 
Glucose  0  420 
1*07 
1272 
Distilled  water 
f  Mucilage  2.260 
j  Dextrin  2  500 
!  Other  carbohydrates  4*220 
j  Tannin  4*900 
j  Other  compounds  precipitated  by  lead  acetate  0*550 
|  Glucose  ..:  1*250 
t  Saccharose  0*170 
Soda  solution  {  ^± ^1^^°^ 
t  Phlobaphene  
.0*600 
.0*800 
15*85 
1*40 
Weak  HC1. 
r  Pararabin  etc  4*800 
\  Starch  3*580 
Chlorine  In  crusting  matter  
HX03  and  KCIO3  Intercellular  matter  
Residue  Cellulose  and  sand(l*35). 
Ash  
Moisture  
Loss  
  8*38 
  13*00 
  17*00 
  16*48 
  316 
  10*60 
  008 
100*00 
In  the  examination  of  the  alcoholic  extract  evidence  having  been 
obtained  of  the  presence  of  a  glucoside,  numerous  experiments  were 
made  with  the  view  of  isolating  it ;  the  following  deserve  to  be  men- 
tioned : 
The  aqueous  solution  of  the  alcoholic  extract  was  freed  from  tan- 
nin by  means  of  lead  acetate,  the  filtrate  treated  with  H2S,  and  the 
clear  liquid  evaporated  ;  decomposition  took  place  with  the  produc- 
tion of  an  insoluble  resin-like  body. 
