August' issl""'}    'Analijtical  Researches  (Old  Invesfigcdions,  401 
butter  to  be  examined  with  pure  butter,  and  with  butter  to  whicli  the 
different  coloring  matters  have  been  added. 
The  presence  of  salicylic  acid  may  be  detected  by  agitating  the  but- 
ter with  warm  salt  water  and  adding  to  this  liquid  a  drop  of  ferric 
chloride,  when  a  violet  coloration  will  be  produced. — Bull,  de  la  Soc. 
de  Pharm.  de  Bordeaux,  1882,  pp.  139-141. 
On  Hydroquinidine.  By.  C.  Forst  and  Chr.  Boehringer. — By  the 
oxidation  of  quinidine  by  potassium  permanganate,  in  a  solution  which 
is  maintained  acid,  the  authors  have  obtained  a  product  of  oxidation 
which  is  crjstallizable  from  alcoliol  in  small  needles,  while  at  the  same 
time  formic  acid  is  produced,  and  a  base  crystallizable  in  prismatic 
needles,  soluble  in  alcohol,  and  rapidly  efflorescing  on  exposure  to  the 
air.  The  authors  have  determined  simply  the  water  of  crystallization 
of  this  base,  which  they  regard  as  hydroquinidine,  C2oH2gN202H~2JH20, 
and  as  produced  during  oxidation. 
From  its  solution  in  ether  this  base  is  deposited  in  thick  tables,  wliich 
are  apparently  rhombic;  its  alcoholic  solution  has  an  alkaline  reac- 
tion. Hydroquinidine  is  dextrogyrate  and  to  about  the  same  extent 
as  quinidine ;  its  fusing  point  is  also  about  the  same,  being  166  to  167°C. 
It  yields  with  chlorine  and  ammonia  the  reaction  of  (|uinine  and  qui- 
nidine, and  its  solution  in  dilute  sulphuric  acid  })resents  a  blue  Huor- 
eacence ;  its  salts  crystallize  readily.  The  chloroplatlnate,  C20H26N2O2 
(HCl)2PtCl^-j-2H20,  is  deposited  on  cooling  in  short  orange-colored 
needles.  The  liydriodafe  crystallizes  in  anhydrous  striated  needles,, 
slightly  soluble  in  cold  water,  and  containing,  according  to  the  estima- 
tion of  the  iodine,  C2oH2g]Sr202HL  The  xiilphde,  (C2oH26N202)2H2!S04 
-f-12H20,  of  which  only  the  water  of  crystallization  has  been  deter- 
mined, forms  voluminous  many-faced  crystals.  The  hydrochlorate 
forms  short  needles  which  are  sparingly  soluble  in  cold  water. — Ibid., 
p.  141  ;  from  Ber.  der  Deufsch.  Ch.  Ges.,  xiv.,  p.  1954. 
A  Reaction  of  Morphine.  By  F.  Tattersall  ("  C'hem.  News,"  41,  p. 
63),  and  Reactions  of  Morphine,  ( hdeine,  and  Atropine.  Bv  Diosc. 
Vitali  {"  Ber.  der  Deutsch.  Ch.  des.,"  14,  p.  582).— Tattersall  has  ascer- 
taiiKid  that  morphin(»,  when  treated  with  sulphuric  acid  and  arseniate 
of  sodium,  jn-oduces  a  violet  color,  Avhich,  by  the  action  of  heat, 
changes  to  green.  Vitali,  in  order  to  effect  this  reaction,  dissolves  the 
morphine  in  concentrated  sulphuric^  a(ud,  adds  the  arseniate  of  sodium, 
and  heats;  a  bluish-violet  coloration  is  first  observed  and  the  liquid 
afterwards  be(;omes  green  ;  by  the  addition  of  water  to  the  latte]*,  a 
26 
