602 
Chemical  Notes. 
Am.  Jour.  Pharm. 
Dec,  1879. 
glass-stoppered  bottles,  and  does  not  contain  the  slightest  trace  of 
ammonia,  is  made  by  Hager  by  mixing  pure  spring-water  with  a  little 
potassium  permanganate,  filtering  at  the  expiration  of  24  hours,  macer- 
ating for  one  day  with  1  per  cent,  purified  animal  charcoal,  again  filter- 
ing, distilling  over  1  per  cent,  potassa  alum  from  a  glass  retort,  reject- 
ing the  first  -J-  of  the  distillate,  and  collecting  the  next  |-  as  pure  distilled 
water  in  a  clean,  dry  glass  bottle. — Ibid.^  Oct.  16,  1879,  p.  385. 
Beer  Analysis. — Dr.  Enders  mixes  1  liter  of  beer  in  an  evoporat- 
ing  dish  with  10  grams  of  fine  granular  animal  charcoal,  evaporates  the 
mixture  to  dryness  on  a  water-bath,  stirring  occasionally,  treats  the 
residue  after  cooling  with  cold  water  until  the  filtrate  passes  colorless,, 
and  then  extracts  the  charcoal  with  hot  alcohol,  which  dissolves  all 
bitter  principles  and  alkaloids  ;  these  may  afterwards  be  readily  deter- 
mined by  their  respective  tests.  The  charcoal  contains,  besides  the 
bitter  principles,  only  a  little  coloring  matter. — Pharm.  Ztg.,  Oct.  l„ 
1879,  p.  609. 
CHEMICAL  NOTES. 
By  Prof.  Samuel  P.  Sadtler. 
Inorganic  Chemistry.—  On  the  Preparation  of  Alumina  Free  from 
Iron. — Condy  and  Rosenthal  (German  patent)  remove  the  iron  from 
bauxite  and  other  alumina  minerals  by  converting  it  into  sulphide.  For 
this  purpose  the  finely  pulverized  mineral  is  heated  in  an  iron  kettle,, 
lined  with  lead,  with  a  solution  of  sodium  sulphide,  the  mixtute  being 
constantly  stirred.  For  2  parts  of  iron,  3  parts  of  sodium  sulphide 
are  to  be  used.  When  the  action  is  complete  the  liquid  is  drained  off, 
the  residue  treated  with  dilute  hydrochloric  acid,  and  the  ferrous  chlor- 
ide washed  out  with  water.  Iron,  lime  and  magnesia  are  almost  com- 
pletely removed  by  this  treatment.  Barium  or  calcium  sulphides  can 
be  used  for  the  same  purpose,  or  hydrogen  and  hydrogen  sulphide  can 
be  led  over  the  heated  bauxite,  in  order  to  make  the  iron  soluble  in 
dilute  hydrochloric  acid. — Dingier*  s  Poly  tech.  four.,  233,  p.  493. 
Artificially  Crystallized  Manganese  Dioxide. — Gorgen  has  prepared 
Mn02  in  artificial  crystals  by  heating  manganic  nitrate  gradually  and  for 
a  considerable  length  of  time  to  1580  to  i62°C.  The  product  had  all 
the  properties,  the  specific  gravity,  hardness,  color  and  crystalline  form 
