256     Chemical  Examination  of  Ipomcea  Purpurea. 
A.m.  Jour.  Pharm. 
June,  1908. 
Filtrate  from  the  Basic  Lead  Acetate  Precipitate. — This  was  treated 
with  hydrogen  sulphide  for  the  removal  of  the  lead,  the  mixture 
filtered,  and  the  filtrate  concentrated  under  diminished  pressure  to 
the  consistency  of  a  thick  syrup.  The  latter,  on  cooling,  deposited 
a  further  quantity  of  the  above  mentioned  mixture  of  potassium 
chloride  and  nitrate.  The  syrupy  liquid,  amounting  to  about  250 
grammes,  only  reduced  Fehling's  solution  very  slowly  on  heating, 
and  no  osazone  could  be  obtained  directly  from  it.  It  was  therefore 
mixed  with  pnrified  sawdust,  the  mixture  thoroughly  dried  in  a 
vacuum,  and  extracted  successively  in  a  Soxhlet  apparatus  with 
ethyl  acetate,  absolute  alcohol,  and  water.  The  amounts  removed 
by  these  solvents  were  about  20,  190  and  40  grammes,  respectively- 
Both  the  ethyl  acetate  and  alcohol  extracts  were  uncrystallizable 
syrups,  and  only  reduced  Fehling's  solution  after  heating  with  a  dilute 
mineral  acid.  They  then  afforded  crystalline  osazones,  melting  at 
2 1 3—2140  C,  thus  indicating  that  by  the  treatment  with  acid  hydrol- 
ysis had  ensued  with  the  production  of  glucose.  In  both  cases 
during  the  hydrolysis  a  peculiar,  fragrant  odor  was  developed,  and 
on  distilling  the  liquid  the  aromatic  substance  was  found  to  be  vola- 
tile in  steam,  but  it  was  only  small  in  amount,  and  did  not  afford  a 
reaction  for  furfural  or  other  aldehydes.  The  final  aqueous  extract 
formed  a  thick  syrup,  which,  in  distinction  from  the  above-mentioned 
ethyl  acetate  and  alcohol  extracts,  reduced  Fehling's  solution  directly 
on  heating,  although  slowly.  After  hydrolysis,  however,  the  reduc- 
tion was  effected  immediately,  and  it  then  afforded  ^/-phenylglucosa- 
zone,  melting  at  2io-2ii°C.  With  the  exception,  therefore,  of 
the  previously  mentioned  inorganic  salts,  nothing  of  a  crystalline 
character  could  be  isolated  from  the  original  aqueous  liquid. 
Examination  of  the  Resin  (B). 
For  the  purpose  of  completely  examining  the  resinous  material 
the  previously  mentioned,  soft,  dark- colored  mass  was  thoroughly 
mixed  with  prepared  sawdust,  the  mixture  dried,  and  extracted 
successively  in  a  Soxhlet  apparatus  with  the  following  solvents : 
(I)  Petroleum  (b.  p.  40-600  C),  (II)  Ether,  (III)  Chloroform,  (IV) 
Ethyl  acetate,  (V)  Alcohol. 
I.  Petroleum  Extract  of  the  Resin. 
This  was  a  soft,  thick  extract,  possessing  a  deep  green  color.  It 
was  hydrolyzed  by  heating  with  an  alcoholic  solution  of  an  excess 
