FUSEL  OIL  FROM  INDIAN  CORN  AND  RYE. 
421 
The  white  precipitate  which  deposited  before  cooling,  was  dried 
at  100°,  and  was  very  electric  ;  it  gave  the  following  analytical 
results  :  0*12  grammes  yielded  0*052  metallic  silver,  or  43*33  per 
cent.,  which  agrees  with  caprylate  of  silver.  I  performed  the 
organic  analysis  by  combustion  with  oxide  of  copper.  The 
results  do  not  accord  so  well  for  caprylate  of  silver,  the  quantity 
at  my  disposal  being  almost  too  small  for  an  accurate  analysis  of 
this  salt ;  0- 1875  grammes  gave  CO2=0*25575,  and  HO  =  0*  1 1 15, 
or  a  percentage  as  follows: 
By  Calculation. 
Ci6 
.  96 
38-20 
37-20 
H«  . 
.  15 
6-00 
6-60 
04 
.  32 
12-77 
12-87 
Ag.  . 
.  108 
43-03 
43-33 
251 
100-00 
100-00 
The  filtrate  from  the  first  of  these  precipitations  gave  on  eva- 
poration in  the  water  bath  a  residue,  which  yielded  to  a  little 
boiling  water  a  grayish  salt,  which  precipitated  on  cooling.  0'027 
of  this  gave  0*013  or  48'14  per  cent,  of  silver.  This  would  corre- 
spond to  caproate  of  silver,  which  contains  48*43  Ag.  The  residue 
of  oil  of  a  portion  of  the  fusel  oil  from  which  the  above  mentioned 
acids  were  separated,  was  treated  with  an  additional  portion  of 
potassa,  and  the  fatty  salts  separated  from  these  aqueous  solutions 
by  chloride  of  sodium,  and  decomposed  in  a  retort  by  sulphuric 
acid.  The  acids  were  boiled  with  baryta  water,  and  filtered  hot ; 
a  dark  resinous  substance  was  left  on  the  filter.  On  cooling,  a 
white  flaky  precipitate  fell ;  carbonic  acid  passed  through  the 
filtrate  from  this  precipitate,  yielded  a  carbonate  of  baryta,  from 
which  scarcely  anything  could  be  obtained  either  by  boiling 
water,*  or  by  exhausting,  when  dry,  with  absolute  alcohol. 
The  baryta  salts  of  the  fatty  acids  were  in  such  small  quantity 
that  a  separation  and  purification  by  crystallization  was  out  of 
the  question.  They  appear  to  consist  of  caprate  and  caprylate  of 
baryta.  This  solution  was  evaporated  in  the  water  bath,  remov- 
ing the  salt  as  soon  as  enough  had  separated  to  perform  an  atomic 
*  The  boiling  water  gave,  on  cooling,  0-445  white  precipitate,  which  con 
tained  34-06  p.  c.  BaO. 
