106 
EXAMINATION  OE  OIL  OP  PEPPERMINT. 
Oil  of  red  cedar  dissolves  at  60°  in  one  part  of  alcohol,  is 
rendered  turbid  by  2i  parts,  and  not  clear  by  the  addition  of  50 
parts  more;  it  dissolves  iodine  slowly  without  any  visible  reac- 
tion, and  mixes  with  an  ethereal  solution  of  bromine  to  a  color- 
less, clear  liquid. 
Borton's  oil  of  peppermint  is  dissolved  by  one-half  part  of 
alcohol,  and  rendered  turbid  by  another  half  part,  and  more  ;  it 
takes  up  iodine  with  but  little  reaction,  thereby  assuming  a  red 
and  brownish  red  color,  without  the  least  spreading ;  ethereal 
bromine  yields  a  deep  rose  color,  darkening  to  a  purplish  black, 
and  thickening  the  oil.  The  rectified  German  oil  agreed  in  its 
pure  state,  and  when  mixed  with  other  oils,  so  nearly  with 
Borton's  oil,  that  the  reactions  of  one  are  nearly  identical  with 
the  reactions  of  the  other. 
The  supposed  spurious  oil  requires  six  parts  of  alcohol  for 
solution,  and  remains  clear  on  the  addition  of  more;  at  60°, 
iodine  has  but  little  effect,  at  80°  it  is  dissolved  without  fulmi- 
nation,  but  with  a  quick  radiating  motion,  without  evolving  any 
vapors,  forming  a  reddish  brown  liquid,  which  scarcely  shows 
any  spreading.  This  oil  mixed  with  ethereal  solution  of  iodine 
and  of  bromine  forms  a  thick  brown  liquid. 
The  fractional  distillates  dissolved,  commencing  with  No.  1, 
in  8|,  8,  4,  7j,  7±,  7,  1,  parts  of  alcohol  and  more.  They  ful- 
minated with  iodine,  Nos.  3  and  6  last,  evolved  purple,  yellow, 
grey  or  white  vapors;  the  solutions  were  brown,  variously 
shaded  with  green,  Nos.  1  and  2  thin,  3  honeylike,  4,  5,  and  6 
more  fluid  than  3;  they  all  showed  spreading,  6  the  least;  No, 
7  dissolved  iodine  to  a  homogeneous  reddish  brown  liquid,  with- 
out any  reaction  and  without  spreading.  These  reactions  with 
iodine  were  observed  at  80°;  at  60°  no  fulmination  took  place, 
only  a  quick  dissolution  or  a  radiating  motion.  With  ethereal 
solution  of  iodine  they  produced  uniform  thin  liquids  of  various 
shades  of  brown,  containing  a  sediment  of  iodine.  No.  7  was 
rendered  reddish  brown  and  thickening.  With  ethereal  bromine 
they  produced  spreading  liquids,  1,  2,  3,  4  colorless,  3,  4  with 
purplish  spots,  the  liquids  assuming  a  greenish  tint ;  5,  yellowish 
green,  6,  brownish  yellow ;  both  spreading,  with  a  brown  color ; 
No.  7,  behaviour  of  Borton's  oil. 
Towards  nitroprusside  of  copper,  the  oils  showed  the  following 
