Am'X^886.arm'}      Gleanings  from  Foreign  Journals,  495 
a  dilute  solution  of  apomorphine  is  added  to  a  dilute  solution  of 
cocaine  hydrochlorate  a  green  coloration  is  produced.  The  reaction 
takes  place  in  several  minutes  and  being  very  delicate  can  be  used  as 
a  reagent. — Phar.  Rundschau,  Prag,  xii,  p.  614. 
Knodalin. — A  mixture  highly  recommended  for  the  destruction  of 
all  kinds  of  vermin  on  plants  consists,  according  to  Barenthin,  of 
2  to  3  grams  nitrobenzol,  10  grams  xanthogenate  of  potassium, 
400  grams  potash  soap,  containing  about  60  per  cent,  of  water,  and 
600  grams  amylic  acohol.  Knodalin  is  a  reddish-brown,  oily  liquid, 
having  an  alkaline  reaction  and  a  strong  order  of  amylic  alcohol. — 
Archiv  der  Pharm.  1886,  xiii,  p.  673. 
Characteristic  Reaction  for  Codeine. — By  rubbing  a  small  quantity 
of  codeine  with  two  drops  of  a  solution  of  hypochlorite  of  sodium 
on  a  watch  crystal  and  adding  four  drops  of  concentrated  sulphuric 
acid  a  beautiful  sky-blue  color  is  produced.  This  reaction  is  charac- 
teristic for  codeine,  as  no  other  alkaloid  is  known  to  produce  the  same 
reaction. — Phar.  Centralhalle,  xxvii,  p.  321. 
Potassium  ferrate. — C.  L.  Bloxam  states  that  ferrate  of  potassium 
can  be  made  in  a  short  space  of  time  by  dissolving  a  piece  of  caustic 
potash  in  a  small  quantity  of  solution  of  chloride  of  iron,  adding 
several  drops  of  bromine  and  warming  slightly.  The  resulting  dark 
brown  mass  is  soluble  in  water,  forming  an  intense  red  solution. 
Barium  chloride  yields  a  heavy  purple-red  precipitate  of  barium 
ferrate,  the  solution  becoming  colorless.  A  beautiful  red  solution  of 
ferrate  of  calcium  is  obtained  by  treating  chlorinated  lime  with 
ferric  chloride  and  boiling  with  water  ;  filtering  through  paper  de- 
stroys the  color.  The  rose-red  color  frequently  noticed  when  boiling 
solutions  of  chlorinated  lime  is  due  to  the  formation  of  ferric  chloride. 
— Chemiher  Zeitung,  x,  p.  178. 
Dr.  Magitot's  Toothache  Drops  consist  of  chloroform,  tincture  of 
opium  and  creasote  of  each  2  grams,  tincture  of  benzoin  6  grams. — 
Les  Nouveaux  Remedes,  ii,  p.  338. 
A  new  and  characteristic  reaction  for  Gold. — To  several  drops  of 
a  dilute  solution  of  chloride  of  gold  is  added  several  drops  of  a 
solution  of  arsenic  acid,  2  or  3  drops  of  solution  of  ferric  chloride 
and  2  or  3  drops  of  hydrochloric  acid,  the  whole  diluted  with  100  cc. 
of  water.  When  a  piece  of  zinc  is  thrown  in  the  mixture  the  liquid 
immediately  around  the  zinc  assumes  a  purple  color,  and  when 
agitated  the  color  is  distributed  to  all  the  liquid,  and  remains  for  half 
