Am.  Jour.  Pharm. 
June,  1891. 
Geranium  Maculatum. 
267 
Calcium  hydrate,  .  .  • 
Tartar  emetic  and  \ 
Ammonium  chloride,  f 
Copper  sulphate,  .  .  . 
Same   and   excess  of 
purplish  precipitate, 
light  brown  " 
cloudiness 
Ammonium  hydrate,  J 
Ferrous  sulphate,  .  .  . 
Ferric  acetate,  .... 
Gelatin,  
Ammoniacal  picric  acid 
Lead  acetate,  .... 
dark -brown  precipitate. 
no  change 
blue-black  ppt. 
red-brown 
red  color 
Copper  acetate, 
drab  precipitate, 
brown  " 
In  almost  all  cases  these  reactions  were  identical  with  those  pro- 
duced by  the  same  reagents  on  gallo-tannic  acid. 
The  action  of  heat  was  tried  on  this  tannin,  as  recommended  by 
T.  E.  Thorpe,1  and  here  as  with  gallo-tannic  acid  it  was  found  that 
pyrogallol  resulted. 
0-200  gram  of  the  tannin,  heated  to  ioo°  C,  with  2  per  cent, 
hydrochloric  acid,  for  several  hours,  yielded  a  solution  which  upon 
cooling  deposited  a  dark  red-brown  precipitate,  soluble  in  alcohol 
and  reprecipitated  by  water  and  having  the  other  properties  of  a  phlo- 
baphene.  The  filtered  liquid  was  agitated  with  acetic  ether,  which 
removed  gallic,  but  no  tannic  acid,  and  but  little  coloring  matter. 
After  this  agitation  stronger  ether  removed  the  last  portions  of 
gallic  acid,  but  no  color. 
The  aqueous  solution  was  now,  as  originally,  red  in  color;  it  was 
heated  to  remove  the  ether,  neutralized  with  sodium  hydrate,  preci- 
pitated with  lead  acetate,  filtered,  the  excess  of  lead  salt  -removed 
from  the  colorless  filtrate  by  dilute  sulphuric  acid,  again  filtered, 
made  alkaline  witfusodium  hydrate,  filtered  and  heated  with  Fehling's 
solution.  The  precipitated  cuprous  oxide  upon  ignition  yielded 
°"°33  grams  of  cupric  oxide,  equal  to  7-42  per  cent,  of 
glucose.  From  the  same  quantity  of  the  tannin,  after  treatment 
with  lead  acetate  and  removal  of  excess  of  lead,  as  above,  there 
were  obtained  2-02  per  cent,  of  glucose,  thus  indicating  the  tannin 
to  be  a  glucoside  decomposable  into  gallic  acid,  glucose  and 
geranium  red. 
Glycerite  of  Iodol  is  prepared  by  Egasse  by  dissolving  iodol  1  gm.  in 
alcohol  16  gm.,  and  adding  glycerin  34  gm. 
1  Chemical  News,  43,  p.  109. 
