20  On  Halogen  Derivatives  of  Chinolines.     { ^"  jar'is^sa""^™' 
in  all  proportions  with  this  naphtha^  and  the  mixture  remains  clear, 
while  lumps  of  resin  separate  from  the  old  and  oxidized  oil. 
This  experience  induced  us  to  extend  the  experiments  to  other  essen- 
tial oils  similar  to  turpentine,  aud  it  was  expected  that  oil  of  lemon,  of 
orange  peel,  and  of  juniper  would  act  in  the  same  way  towards  petro- 
leum ether.  , 
Experiment  confirmed  this  expectation.  Not  merely  the  oils  named, 
but  many  other  fresh  oils  could  be  distinguished  in  this  way  from  older 
oils,  viz.,  the  oil  of  aniseed,  fennel,  peppermint,  mint,  and  rosemary. 
Beside  these  I  also  tried  old  oleum  carojjJiyllorwn,  carvi,  macidis,  cin- 
namorni,  salvias,  serpylH,  and  thynii,  but  could  not  compare  the  results 
with  those  of  fresh  oils  of  the  same  kind  because  I  had  none  of  the 
latter  on  hand. 
I  consider  such  experiments  very  useful,  and  recommend  any  one 
who  has  an  opportunity,  whether  apothecary  or  oil  manufacturer,  to  test 
the  action  of  other  oils  toward  petroleum  ether  and  publish  his  results. 
The  experiment  is  performed  by  dropping  one  drop  of  the  oil  into 
a  dry  test  tube,  and  then  a  drop  of  naphtha,  and  observing  whether  the 
mixture  remains  clear  or  becomes  turbid.  After  we  add  two,  then  three 
and  more  drops  of  naphtha,  and  can  be  certain  whether  a  white  pre- 
cipitate or  a  milky  turbidity,  or  even  an  opalescence  results  from  the 
presence  of  a  resin. 
When  old  oil  of  anise  was  used  it  did  not  mix  with  naphtha,  but  the 
fresh  oil  was  miscible  in  every  proportion.  Oil  of  orange  gave  a  turbid 
mixture;  oil  of  lemon,  the  resin  was  deposited  on  the  side  of  the  test 
tube ;  oil  of  fennel  only  partially  dissolves  when  old ;  oil  of  juniper 
forms  white  lumps ;  oil  of  peppermint  becomes  turbid;  while  oil  of 
rosemary  scarcely  mixes  at  all.  Fresh  oil  of  turpentine,  after  standing 
open  a  week  or  two,  becomes  turbid.  If  alcohol  is  added  to  the  oils 
the  reaction  will  not  take  place. — Cheni.  Jour.,  Nov.  10,  1882  ;  Liqueur 
Fahrihant. 
On  Halogen  Derivatives  of  Chinolines.  W.  La  Coste.— 
The  author  prepares  these  derivatives  in  a  manner  differing  from  the 
original  of  Skraup,  86  grams  of  bromaniline  and  the  corresponding 
quantity  of  glycerin,  sulphuric  acid  and  nitrobenzol  are  carefully 
heated.  The  product  was  distilled  with  steam  after  diluting  w^ith 
Avater.  The  residue  contained  70  grams  of  pure  monobromchinoline. 
Dinitrochinoline  and  phenylchinoline  were  prepared  by  similar  meth- 
ods.— Jour.  Amer.  Chem.  Soc,  Nov.,  1882;  Berichte,  xv,  p.  557. 
