Am.  Jour.  Pharm. 
Nov.,  1892. 
The  Acids  of  Butter. 
583 
of  barium  separated  on  cooling.  This  was  recrystallized  from  80 
per  cent,  alcohol,  and  then  gave  19  38  per  cent.  Ba ;  calculated  for 
barium  oleate,  19-59. 
The  chloroform  solution  gave,  after  cooling  and  filtering,  on  the 
addition  of  four  volumes  of  ether,  a  white  amorphous  precipitate, 
which,  on  drying,  became  a  brown,  gummy  amorphous  mass.  Upon 
analysis  its  composition  was  found  to  be  Ba.  (C15H2704)2.  The 
author  regards  this  acid  as  C15H2804.  It  easily  decomposed,  as  after 
some  time  its  barium  salt  becomes  insoluble  in  chloroform. 
Portion  IV.  This  is  insoluble  in  ether,  acetic  ether  and  chloro- 
form. The  analysis  led  to  the  formula  C29H5405  (dibasic)1  for  the 
acid. 
Portion  III.  This  portion  was  fractionated  under  30  mm.  pres- 
sure ;  Bruhl's  receiver  (Ber.,  1888,  3339)  being  employed.  Frac- 
tions were  collected  :  A  2000  —  2300  ;  B  23 1°  —  2380  ;  C  2400 
—  242°  ;  D  2440  —  2480  ;  E  251°  —  2550.  The  two  last  frac- 
tions were  crystallized  from  a  small  quantity  of  alcohol. 
The  fractions  B  —  E  were  fractionally  precipitated  by  quantities 
of  25  cc.  of  a  normal  magnesium  acetate  solution.  The  fractions 
were  then  boiled  with  hydrochloric  acid,  and  the  melting  points  of 
the  acids  taken ;  they  were  then  transformed  into  silver  salts,  and 
the  silver  estimated.  Fraction  Ei  melted  at  68°  ;  after  re- fractionating 
the  melting  point  rose  to  690,  and  the  silver  salt  contained  27-57 
per  cent.  Ag.  (calc.  for  stearic  acid  27*62  per  cent.).  Em  melted  at 
620,  and  its  silver  salt  gave  2973  per  cent.  Ag.  (calc.  for  palmitic 
acid  29*75  Per  cent.) 
Fraction  E  was  then  principally  palmitic  acid  with  a  small  quan- 
tity of  stearic  acid.    Arachidic  acid  was  not  detected. 
Fraction  D  was  also  palmitic  acid. 
Fraction  C  (weighing  131  grammes)  was  dissolved  in  700 
grammes  of  alcohol,  and  deposited,  after  24  hours,  31-5  grammes  of 
solid  acids,  principally  palmitic  acid ;  the  remainder  was  fractionally 
precipitated  by  magnesium  acetate,  seven  fractions  being  obtained. 
Fractions  CU] — Cvii  were  magnesium  myristate  ;  the  acid  fused  at  530 
and  the  silver  salt  contained  32-22  per  cent.  Ag.  (calculated  for 
myristic  acid  32-24  per  cent.). 
Fraction  B  still  contained  myristic  acid  ;  Biv  and  Bv  were,  how- 
ever, lauric  acid,  for  the  acid  melted  at  43-5°,  and  the  silver  salt 
1  Probably  a  mixture. 
