OIL  OF  CAJEPUT. 
545 
ADULTERATION  OF  WAX  WITH  PARAFFIN. 
Ludolt  has  met  with  a  specimen  of  wax  adulterated  with  pa- 
raffin. He  detected  the  adulteration  in  the  following  way, 
(^Dingier' s  Polyteeh.  Journal^  Bd.  clx.  s.  224)  :  He  heated  a 
piece  of  the  wax  with  an  excess  of  fuming  sulphuric  acid.  When 
the  wax  melted,  a  strong  action  took  place,  and  when  the  evolu- 
tion of  vapor  ceased  the  heat  was  continued  a  little  longer,  and 
then  the  mixture  was  allowed  to  cool.  After  cooling,  the  paraf- 
fin was  found  as  a  transparent  layer  upon  the  sulphuric  acid. 
So  much  sulphuric  acid  must  be  used,  that  when  the  operation 
is  ended  the  black  residue  may  be  fluid,  otherwise  it  is  difficult 
to  separate  the  paraffin.  Very  small  quantities  of  paraffin, 
the  author  says,  may  be  discovered  in  this  way.  English  sul- 
phuric acid  is  not  convenient  for  the  purpose,  as  it  decomposes 
the  wax  but  slowly. — London  Ohem,  News,  Aug.  10,  1861. 
OIL  OF  CAJEPUT. 
Schmidt"publishes  Trans.  Royal  Soc.  Edin.,  vol.  xxii.,  p.  360) 
some  researches  on  cajeput  oil.    His  analysis  agrees  with  that 
of  Blanchet  and  Sell — C2oH^6  "I"  ^-^^ — instead  of  the  name 
Dadyle,  given  to  it  by  these  chemists,  Schmidt  proposes  to  call 
the  oil  the  Bihydrate  of  Qajeputene.    It  boils  at  175°  C,  be- 
comes acid  in  the  air,  especially  in  the  presence  of  alkalies ; 
hydrochloric  acid  separates  a  resinous  body.    When  heated  to 
boiling,  and  some  sulphuric  acid  is  added  gradually,  the  oil  be- 
comes colored,  and  between  170^  and  175*^  a  liquid  distils 
having  the  composition  C2oH^6+HO,  which  the  author  considers 
the  monohydrate  of  Cajeputene.  The  vapor  density  of  this  body 
is  5-02,  and  corresponds  to  4  volumes,  which,  as  it  contains  an 
odd  atom  of  oxygen,  is  an  exceptional  case.    Repeatedly  dis- 
tilled with  anhydrous  phosphoric  acid,  this  monohydrate  forms 
a  series  of  hydrocarbons  of  different  degrees  of  volatility.  The 
first  cajeputene  Q2^^\q  ^^^^^  between  160^  and  165^,  and  is  a 
colorless  liquid,  smelling  like  the  hyacinth ;  it  is  insoluble  in 
alcohol,  but  soluble  in  ether  and  oil  of  turpentine.     Its  sp.  gr.  . 
at  15°  is  -850;  vapor-density  4-717.    Between  176^  and  178« 
35 
