A  octobe£  Si*™' }  The  Examination  of  Chaulmoogra  Oil.  477 
the  oil  were  placed  on  a  porcelain  tile  and  one  drop  of  sulphuric 
acid  was  added.  On  stirring  with  a  glass  rod  the  following  changes 
of  color  were  noticed : 
(1)  Smith  oil  gave  a  yellow  coloration,  which  changed  rapidly 
to  reddish-brown  and  finally  to  dirty  brown.  If  five  drops  of  oil 
be  mixed  with  five  drops  of  sulphuric  acid,  then  the  same  colora- 
tions are  noted,  but  the  oil  is  converted  into  a  resinous  mass. 
(2)  B.  K.  Paul  oil  passed  through  the  same  changes  of  color, 
but  finally  it  acquired  an  olive  green  tint.  The  mixture  of  oil  and 
sulphuric  acid  remains  fluid  when  equal  parts  of  oil  and  acid  were 
mixed. 
(3)  Acid  obtained  from  Smith  oil,  when  similarly  treated,  gave 
a  yellow,  then  reddish-brown,  dirty  brown,  and,  after  some  time,  a 
dirty  green  color. 
(4)  Acid  obtained  from  B.  K.  Paul  oil  under  similar  condi- 
tions gave  a  yellow,  then  reddish-brown,  dirty  brown,  and  finally  a 
dirty  green  color,  the  latter  coloration  coming  out  more  quickly 
than  in  the  case  of  the  other  acids. 
(5)  Chaulmoogra  fat  gave  changes  of  color  similar  to  B.  K. 
Paul  oil,  the  product  remaining  liquid. 
N.  B. — The  coloration  with  strong  sulphuric  acid  may  there- 
fore be  used  to  distinguish  the  two  kinds  of  oils. 
(B)  Maumene  Number. — The  rise  of  temperature  by  the  ac- 
tion of  50  grammes  of  oil  and  10  Cc.  pure  concentrated  sulphuric 
acid  was  recorded.  Thus:  (1)  Smith  oil,  86°  C. ;  (2)  B.  K.  Paul 
oil,  83. 50  C.  During  the  reaction  there  was  evolution  of  sulphur 
dioxide,  the  oil  being  converted  into  a  tough,  resinous  mass. 
(C)  Valenta  Test. — Five  cubic  centimetres  of  oil  were  mixed 
with  5  Cc.  of  pure  glacial  acetic  acid  and  the  temperature  of  tur- 
bidity noted.  Thus  it  was  found:  (1)  Valenta  test  of  Smith  oil, 
1010  C.  (2)  In  case  of  B.  K.  Paul  oil  it  completely  dissolved  in  the 
acid  at  ordinary  temperature,  so  Valenta  test  could  not  be  carried. 
It  was  further  found  that  at  ordinary  temperatures  the  oil  is  mis- 
cible  in  any  proportion  with  up  to  double  its  volume  of  glacial  acetic 
acid.  If  more  acid  is  added  above  this,  then  the  liquid  becomes 
turbid.  The  oil  is,  however,  miscible  with  slightly  warm  acetic  acid 
in  any  proportions.  (3)  The  chaulmoogra  fat  was  also  found  to 
be  readily  soluble  in  glacial  acetic  acid. 
Hence  it  is  concluded  that  the  solubility  of  B.  K.  Paul  oil  in 
glacial  acetic  acid  is  due  to  the  presence  in  it  of  a  large  quantity  of 
