Amjane'i5Trm'}    Chemical  Examination  of  Ipomce a  Purpurea.  279 
Ether  Extract  of  the  Hydrolyzed  Resin. — The  entire  amount  of  this 
extract  (13  grammes)  was  brought  into  a  flask  provided  with  a  re- 
flux condenser,  together  with  130  c.c.  of  5  per  cent,  aqueous  sul- 
phuric acid,  and  the  mixture  boiled  for  three  hours.  The  liquid,  cn 
cooling,  remained  quite  clear,  and  had  a  pale  yellow  color.  It  was 
distilled  with  steam,  and  the  distillate  extracted  with  ether,  but  this 
removed  practically  nothing.  A  very  small  amount  of  acid  was,  how- 
ever, contained  in  the  aqueous  distillate,  and  this,  after  conversion 
into  a  barium  salt,  afforded  reactions  indicating  the  presence  of 
formic  and  butyric  acids. 
The  aqueous  acid  liquid  remaining  in  the  distillation  flask  after 
the  removal  of  the  volatile  acids  with  steam,  as  above  described, 
was  extracted  with  ether,  and  the  ethereal  liquid  shaken  with  a 
solution  of  sodium  carbonate.  After  the  removal  of  the  ether,  a  very 
small  amount  of  an  oily  liquid  was  obtained.  The  sodium  carbonate 
liquid,  when  acidified  and  extracted  with  ether,  yielded  a  small 
amount  of  an  oily  acid,  but  not  sufficient  for  its  further  examination. 
The  aqueous  acid  liquid,  which  had  been  extracted  with  ether, 
reduced  Fehling's  solution  on  heating.  It  was  treated  with  baryta  for 
the  removal  of  the  sulphuric  acid,  and  the  filtrate  concentrated,  when 
it  formed  a  thick  syrup  which  was  found  to  contain  the  barium  salt 
of  a  readily  soluble  organic  acid.  The  attempts  to  obtain  this  acid 
in  a  solid  state  were  unsuccessful. 
Chloroform  Extract  of  the  Hydrolyzed  Resin. — The  amount  of  this 
extract  was  only  4  grammes.  On  treatment  with  dilute  sulphuric 
acid  it  yielded  products  very  similar  to  those  afforded  by  the  ether 
extract  of  the  hydrolyzed  resin.  Thus  in  distilling  the  acid  liquid 
with  steam,  the  distillate  was  found  to  contain  a  very  small  quantity 
of  a  neutral  oil,  together  with  formic  and  butyric  acids,  while  the 
liquid  remaining  in  the  distillation  flask  reduced  Fehling's  solution 
on  heating,  and,  after  the  removal  of  the  sulphuric  acid  by  baryta 
and  concentrating,  yielded  a  very  small  amount  of  a  syrup  contain- 
ing the  barium  salt  of  a  readily  soluble  organic  acid. 
Ethyl  Acetate  Extract  of  the  Hydrolyzed  Resin. — This  extract,  like 
the  preceding  ones,  was  relatively  small  in  amount.  The  entire 
quantity  (9-3  grammes)  was  heated  for  about  four  hours  with  100  c.c. 
of  5  per  cent,  aqueous  sulphuric  acid.  On  cooling,  the  liquid  in  the 
flask  was  observed  to  contain  a  small  amount  of  a  white,  flocculent 
substance,  together  with  a  small  cake  of  solid  matter.   It  was  there- 
