/ 
622  Action  and  Reactions  of  CJiinoIin.  {^°'Dec^!'l88?™■ 
second  0*2  gram  of  quinia  hydrochlorate.  All  these  mixtures  passed 
into  vigorous  fermentation,  and  after  five  days  there  was  found,  by 
means  of  Feliling's  solution,  in  the  chinolin  mixture,  0*30  gram  of 
grape  sugar ;  in  the  quinia  mixture,  0*25  gram ;  and  in  the  control 
mixture,  0*07  gram. 
Experiment  2. — Three  beakers  were  prepared,  each  with  5  grams  of 
grape  sugar,  5'0  grams  of  pressed  yeast,  and  100  cc.  of  water.  To 
one  was  added  5  grams  of  chinolin  hydrochlorate,  and  to  a  second  2*0 
grams  of  quinia  hydrochlorate  (or  ten  times  the  quantity  used  by 
Liebig).  In  this  case  also  all  three  passed  the  next  day  into  brisk 
fermentation,  the  chinolin  mixture  being  indeed  the  most  vigorous 
and  the  quinia  the  weakest^  After  three  days  the  fermentation  had 
nearly  ended,  and  the  chinolin  mixture  contained  0*26  gram  of  grape 
sugar,  the  quinia  mixture  0*71  gram,  and  the  control  mixture  0'50 
gram. 
Chinolin,  therefore,  even  in  5  per  cent,  solution,  does  not  in  the 
least  stop  the  alcoholic  fermentation ;  quinia,  also,  even  in  2  per  cent, 
solution,  does  not  prevent  it. 
The  antipyretic  and  antiseptic  properties  of  chinolin  have  already 
brought  it  into  medicinal  use,  and  therefore  the  following  information 
as  to  some  easily  carried-out  reactions  for  testing  the  purity  of  the  pre- 
paration or  detecting  it  in  excrement,  etc.,  may  find  a  place. 
Chinolin  salt  in  aqueous  sohition  is  precipitated  milky  white  by 
potash  ley.  The  precipitate  dissolves  witli  difficulty  in  excess  of  the 
precipitate,  easily  in  ether,  benzin  and  strong  alcohol,  and  somewhat 
less  rapidly  in  carbon  bisulphide,  cliloroform  and  amy  lie  alcohol. 
Sodium  carbonate  also  precipitates  chinolin  white,  with  evolution 
of  carbonic  anhydrid ;  the  precipitate  is  insoluble  in  excess. 
Ammonia  produces  a  white  precipitate,  but  this  is  tolerably  easily 
soluble  in  excess.    Ammonium  carbonate  behaves  similarly. 
Solution  of  iodine  in  iodide  of  potassium  (potassium  iodide  7  parts, 
iodine  5  parts,  water  100  parts)  produces  a  red-brown  precipitate  inso- 
luble in  hydrochloric  acid.    Limit  of  the  reaction  :  1  in  25,000. 
Phosphomolybdic  acid  (10  parts  of  sodium  phosj)homolybdate  in 
100  parts  of  water  and  nitric  acid  added  uj)  to  a  strongly  acid  reac- 
tion) gives  with  solution  of  chinolin  salt  to  which  nitric  or  hydro- 
chloric acid  has  been  added  a  yellowish-white  precipitate,  which 
readily  dissolves  colorless  in  ammonia.  Limit  of  the  reaction ;  1  in 
25,000. 
