226 
Bark  of  Populus  Alba. 
Am.  Jour.  Pbarm. 
May,  1892. 
solution  was  then  rendered  alkaline  and  treated  as  before.  On 
evaporating  these  liquids  separately,  it  was  found  that  ether  had 
extracted  from  both  the  acid  and  the  alkaline  solutions  a  bitter 
principle  which  responded  to  tests  for  a  glucoside,  but  was  not 
obtained  in  a  pure  state. 
ANALYSIS  OF  THE  BARK  OF  POPULUS  ALBA,  Linne. 
By  Milton  Frank  Schaak,  Ph.G. 
Abstract  from  a  Thesis. 
The  bark  of  trees  grown  in  the  United  States  was  reduced  to  a 
fine  powder,  of  which  50  gm.  were  treated  according  to  Dragen- 
dorff's  method,  with  the  following  results : 
Petroleum  ether  extract,   2*110 
Soluble  in  alcohol,   1*804 
Insoluble  in  alcohol,   '306 
Stronger  ether  extract,   1*036 
Soluble  in  water,   "030 
Alcohol,   '854 
Ether  only,   "152 
Absolute  alcohol  extract,   4*652 
Soluble  in  water,   2766 
Insoluble  in  water,   r886 
Aqueous  extract,   9*100 
Mucilage,   i'75o 
Glucose,   *i8o 
Saccharose,    '216 
Undetermined,   6*954 
Caustic  soda  extract,    .  .  .   2*288 
Pectin,   1*040 
Not  precipitated  by  alcohol,   1*248 
Hydrochloric  acid  extract,   7*852 
Pararabin,   2*964 
Calcium  oxalate,    4*780 
Undetermined,   *io8 
Chlorine  water  extract,   3*620 
Lignin  and  iucrusting,   3*620 
Nitric  acid  and  chlorate  of  potassium  extract,    .  20*740 
Intercellular  substance,   20*740 
Residue,   40*920 
Containing  ash,    4 '5 00 
Pure  cellulose,   36*420 
Moisture,     .   6*500  6*500 
Ivoss,    1*820  1*820 
100*000 
IOO'OOO 
