Amju°nTi?08arm*}     Chemical  Examination  of  Ipomoea  Purpurea.  273 
ether  removed.  A  small  amount  of  a  dark  red  oil  was  thus  obtained 
which,  on  standing  for  some  time,  became  solid.  This  solid  sub- 
stance was  dried  on  a  porous  plate  and  crystallized  from  hot  water, 
when  it  separated  in  fine,  long  needles,  melting  at  100-1010  C.  It 
consisted  of  a  further  small  amount  of  the  new  acid  which  is  de- 
scribed below. 
The  above-mentioned  acid  filtrate,  which  had  been  extracted  witn 
ether,  was  treated  with  baryta  for  the  removal  of  the  sulphuric  acid, 
and  the  filtrate  evaporated  under  diminished  pressure  to  the  con- 
sistency of  a  thick  syrup,  the  amount  of  which  was  18  grammes. 
This  syrup  readily  reduced  Fehling's  solution  on  heating,  and  yielded 
^-phenylglucosazone,  melting  at  2150  C,  thus  indicating  the  pres- 
ence of  glucose.  It  also  contained  a  readily  soluble  organic  acid, 
which  could  not  be  separated  from  the  sugar. 
Isolation  of  a  New  Dihydroxymonocarboxylic  Acid,  Ipurolic  Acid, 
C13H25(OH)2  •  C02H. 
The  cake  of  brown  resinous  matter  obtained  by  the  treatment  of 
the  alcohol  extract  of  the  resin  with  dilute  sulphuric  acid,  as  above 
described,  was  dried  on  a  porous  plate,  then  dissolved  in  alcohol, 
the  solution  mixed  with  purified  sawdust,  and  the  mixture,  after 
being  thoroughly  dried,  extracted  successively  in  a  Soxhlet  apparatus 
with  light  petroleum  and  ether,  after  which  nothing,  remained  on 
the  sawdust.  The  petroleum  removed  about  2  grammes  of  an  oily 
substance  which  was  soluble  in  a  solution  of  sodium  carbonate  and 
the  fixed  alkalis,  and  on  acidifying  these  solutions  it  separated  in  its 
original  form.  On  boiling  this  oily  product  repeatedly  with  large 
volumes  of  water,  filtering  the  liquids  while  hot,  and  allowing  them 
to  cool  slowly,  a  small  amount  of  a  colorless,  crystalline  substance 
was  deposited.  This  melted  at  68°  C,  and  was  apparently  identical 
with  a  hydroxylauric  acid,  which  was  subsequently  obtained  in 
larger  quantity,  as  will  presently  be  described. 
The  subsequent  extraction  of  the  brown  resinous  matter  with 
ether  yielded  about  5  grammes  of  a  viscid  liquid,  which  solidified  on 
cooling.  This  solid  substance  was  dissolved  in  a  dilute  solution  of 
sodium  hydroxide,  when,  after  standing  for  some  time,  a  product 
separated  which  appeared  to  be  crystalline.  The  solution  was  there- 
fore diluted  with  water,  heated  with  a  little  animal  charcoal,  filtered, 
and  concentrated,  when,  on  cooling,  the  whole  solidified  to  a  crys- 
