A October  i9i?m' }  The  Examination  of  Chaulmoogra  Oil.  479 
(3)  Chaulmoogra  Fat. — 1.4748  grammes  required  21.5  Cc.  acid. 
Therefore,  saponification  value  =  (33-5~2i-5)X28-o6  ^  336-72  =  228.3. 
1-4748  1-4748 
(F)  Hubl  A  alue. — The  method  of  above  quoted  authority  was 
followed.    Only  25  Cc.  of  Hubl  solution  ivas  used  instead  of  30  Cc. 
(1)  Smith  Oil. — 0.2314  gramme  of  oil  taken.  After  three 
hours'  action  26.7  Cc.  decinormal  thiosulphate  solution  were  re- 
quired for  excess  of  iodine.  Blank  experiment  required  44.3  Cc.  thio- 
sulphate solution.   Therefore  Hubl  value  ==  i7-6  X -0127  x  100      6  g8 
Another  sample  gave  94.67. 
(2)  B.  K.  Paul  Oil. — 0.2830  gramme  of  oil  taken.  20.8  Cc. 
thiosulphate  solution  were  required.    Therefore  Hiibl  value  = 
23-5  X  -0127  X  100  _ 
■2830 
'^Xioo    =  I05-47- 
•2830  3 
Another  sample  gave  101.87. 
(3)  Chaulmoogra  Fat. — 0.3294  gramme  taken.  17.5  Cc.  thio- 
sulphate solution  were  required  to  neutralize  iodine.  Blank  experi- 
ment required  44.3  Cc.  iodine.   Therefore  Hiibl  value  = 
26-8  X  -0127  X  100  _IOo  ~ 
Another  sample  gave  105.39. 
(G)  Acetyl  Value. — The  acetyl  value  was  determined  accord- 
ing to  the  Lewkowitsch  process,  the  final  determination  being  made 
by  the  filtration  method. 
(1)  Smith  Oil. — 10.68  grammes  of  oil  were  acetylated  with 
15  Cc.  acetic  anhydride.  1.9006  grammes  of  dry  acetylated  oil,  after 
boiling  with  25  Cc.  Kottstorfer  solution  and  neutralization  with 
exact  quantity  of  standard  acid,  required  6.5  Cc.  decinormal  alkali 
to  neutralize  excess  acid.    Therefore  acetyl  value  =  6'5  X  5.61  _ 
1-9006 
19.1. 
(2)  B.  K.  Paul  Oil. — 8.57  grammes  of  oil  were  acetylated. 
2.2858  grammes  of  acetylated  oil  required  16.26  Cc.  XaOH.  There- 
fore acetyl  value  =  16-26X5-61  = 
■  2-2858  oy  y 
The  low  acetyl  value  proves  the  absence  of  hydroxy  acids  and 
further  indicates  that  the  fatty  acids  are  present  in  the  oil  almost 
wholly  as  triglycerides.  In  the  case  of  B.  K.  Paul  oil,  there  may 
have  been  sojne  decomposition,  indicating  the  rancidity  of  the  oil. 
This  may  be  due  to  the  expression  of  the  oil  by  the  hot  process. 
