^junTi'.mT'}        Madura  Aurantiaca,  Nuttall.  259 
gallotannic  acid  was  not  present.  (According  to  Chevreul,  moric 
acid  is  precipitated  by  solution  of  gelatin,  but  this  is  denied  by  Wag- 
ner. Further  experiments  made  with  moric  acid  obtained  from  Ma- 
dura aurantiaca  proved  that  it  is  not  precipitated.) 
Upon  addition  of  an  alkali  to  the  decoction,  a  bright  yellow  color 
was  produced,  this  seeming  to  indicate  the  presence  of  moric  acid. 
To  litmus  the  decoction  gave  a  decided  acid  reaction. 
With  iodohydrargyrate  of  potassium  no  precipitate  was  produced. 
When  digested  with  animal  charcoal,  the  decoction  was  entirely 
deprived  of  all  bitter  taste  and  coloring  matter,  alkalies  not  striking 
a  shade  of  color  with  the  liquid  filtered  from  the  charcoal.  Experi- 
ments having  in  view  the  separation  of  the  coloring  principles  from 
the  charcoal  gave  no  satisfactory  results. 
The  decoction,  upon  evaporation,  gave  a  soft  extract,  of  a  brown 
color,  and  having  a  sweet,  astringent  taste,  with  a  trace  of  bitterness. 
A  cold  infusion  of  the  fresh  bark,  when  heated  to  boiling,  was  not 
coagulated,  showing  the  absence  of  albumen.  With  alkalies  and  fer- 
ric chloride  the  infusion  gave  the  same  reactions  as  the  decoction. 
By  distillation  of  a  portion  of  the  fresh  bark  with  water,  a  liquid 
was  obtained  having  the  odor  of  the  bark,  but  being  perfectly  clear 
and  transparent.  This  would  indicate  the  presence  of  but  a  small 
amount  of  volatile  oil. 
The  distillate  gave  no  coloration  with  alkalies,  showing  the  non- 
volatility  of  the  coloring  principles  with  the  vapors  of  water. 
Final  Examination. — Eight  troyounces  of  the  fresh  bark  were  cut 
up  small  and  boiled  with  successive  portions  of  water  until  exhausted. 
The  dregs  from  this  boiling  were  dried  and  then  reduced  to  powder. 
The  mixed  decoctions  were  filtered  by  aid  of  pulp  of  paper,  and  evap- 
orated to  eight  fluidounces.  Upon  the  addition  of  alcohol,  the  gummy 
matter  was  precipitated,  and  separated  by  filtration,  the  filter  being 
washed  with  alcohol,  and  the  washings  added  to  the  liquid.  This 
hydro-alcoholic  solution  was  then  evaporated  to  a  soft  extract  and 
redissolved  in  about  four  fluidounces  of  alcohol.  To  this  was  added 
ether  in  sufficient  quantity  to  precipitate  the  glucose  as  a  thick  syrupy 
fluid,  from  which  the  ethereo-alcoholic  solution  was  separated.  To 
this  was  added  eight  fluidounces  of  water,  and  by  careful  distillation 
the  ether  and  alcohol  were  separated,  the  aqueous  liquid  then  being 
set  aside.  After  standing  for  two  or  three  days  a  deposit  of  a  brown 
color  was  found.    This  was  separated  upon  a  filter,  the  mother  water 
