Am'ju°ne,'i908arm'}     Chemical  Examination  of  Ipomcea  Purpurea.  267 
(I)  0-1300  of  salt  gave  on  ignition  0-05 14  Ag.  Agrr=39/5 
(11)0  0974       "  "  "      0-0416  Ag.    Ag  =  42-7 
(111)0  0464       "  "  "      0-0198  Ag.    Ag  =  427 
C8H1502  Ag  requires  Ag  =  43-0  per  cent. 
C10H19O2  Ag     «       Ag  =  387  per  cent. 
The  acids  remaining  in  the  aqueous  distillate  after  extraction  with 
ether  were  converted  into  a  barium  salt.  This  was  at  first  syrupy, 
but  soon  solidified  almost  completely,  and  amounted  to  about  two 
grammes.  It  afforded  reactions,  indicating  the  presence  of  formic  and 
butyric  acids.  The  salt  was  first  brought  on  to  a  porous  tile  to 
deprive  it  of  a  little  mother-liquor,  then  recrystallized  three  times 
from  water,  and,  after  being  heated  to  1  io°  C.  until  of  constant 
weight,  was  analyzed. 
0-4028  of  the  dried  salt  gave  03574  BaS04.    Ba  —  52-2 
(CH02)2  Ba  requires  Ba  =  60-4  per  cent. 
(C4H702)2  Ba       "      Ba  ==  44- 1  per  cent. 
This  salt  thus  appears  to  have  consisted  of  barium  formate  and 
butyrate  in  about  equal  proportions.  From  the  above  results  it  is 
also  seen  that  the  volatile  acids  formed  by  the  treatment  of  the  resin 
with  dilute  sulphuric  acid  are  very  similar  in  character  to  those  pro- 
duced by  its  fusion  with  potassium  hydroxide. 
The  dark  yellow,  aqueous  liquid  remaining  in  the  distillation 
flask  was  filtered  from  the  resin  and  extracted  with  ether,  the  ethe- 
real liquid  being  dried  with  calcium  chloride  and  the  ether  removed. 
A  very  small  quantity  of  an  acid,  oily  liquid  was  thus  obtained, 
which  gave  a  brown  coloration  with  ferric  chloride.  The  aqueous 
liquid  which  had  been  extracted  with  ether,  was  treated  with  baryta 
for  the  removal  of  the  sulphuric  acid,  filtered,  and  the  filtrate  con- 
centrated, when  a  small  amount  of  a  syrupy  liquid  was  obtained, 
which  immediately  reduced  Fehling's  solution  on  heating,  and  yielded 
^-phenylglucosazone,  thus  indicating  the  presence  of  glucose.  This 
syrupy  liquid  also  contained  a  readily  soluble  organic  acid. 
The  resin  which  was  separated  from  the  acid  liquid  after  distilla- 
tion with  steam,  as  above  described,  was  dried,  dissolved  in  alcohol, 
and  mixed  with  purified  sawdust.  The  thoroughly  dried  mixture 
was  then  extracted  successively  in  a  Soxhlet  apparatus  with  light 
petroleum  and  ether,  but  only  relatively  small  amounts  of  resinous 
products  of  an  acidic  nature  were  thus  obtained. 
