i66 
Analysis  of  Rhamnus  Purskiana. 
(Am  Jour.  Pharm. 
(       April,  1879. 
(2)  The  Chemical  Constituents  of  the  Bark. 
I.  A  Brown  Resin,  of  strong  bitter  taste,  colored  vivid  purple-red 
by  potassium  hydrate  solution.  This  resin  is  contained  mostly  in  the 
middle  and  inner  layers  of  the  bark.  It  is  sparingly  soluble  in  water,  freely 
soluble  in  alcohol  and  dilute  alcohol,  and  scarcely  at  all  soluble  in  abso- 
lute ether,  soluble  in  chloroform,  in  benzol  (of  coal  tar),  and  in  car- 
bon disulphide  ;  soluble  in  caustic  alkali  solution,  with  splendid  color 
above  mentioned,  and  precipitated  from  this  solution  by  acids.  Con- 
centrated sulphuric  acid  colors  it  blood-red.  It  is  removed  from  alco- 
hol solution  by  animal  charcoal. 
sill 
ill  IP 
mm 
•I 
Transverse  Section, 
c  b 
Longitudinal  Section. 
II.  A  Red  Resin,  nearly  tasteless,  colored  rich  brown  by  potassium 
hydrate  solution.  It  is  insoluble  in  water,  soluble  in  alcohol  and  dilute 
alcohol,  not  freely  soluble  in  ether,  or  chloroform,  or  carbon  disulphide; 
soluble  in  caustic  alkali  solution,  with  the  brown  color  above  mentioned^ 
