TESTING  ANTIMONY  FOR  ARSENIC.  79 
whole  subject  is  of  great  interest  to  physiologists  and  chemists, 
and  may  be  the  occasion  of  important  discoveries. 
Note. — The  principal  literature  may  be  found  in  the  following 
original  papers : 
Liebig  Ann.  Chem.  Pharm.  I,  189 
Staedeler,  Ann.  Chem.  Pharm.  LXI,  101 
Dumas,  An.  de  Chim.  Phys.  LVI,  123 
Regnault,  An.  de  Chim.  Phys.  LXXI,  409 
Wurtz.,  An.  de  Chim.  Phys.  XLIX,  58 
Kolbe,  Ann.  Chem.  Pharm.  CVI,  144 
Kopp,  Ann.  Chem.  Pharm.  XCIV,  257 
Kopp,  Ann.  Chem.  Pharm.  XCV,  307 
Medical  Gazette,  New  York,  November  6th,  1869  ;  page  267. 
— New  York  Jour,  of  Applied  Pharm. ^  Dec.  1869. 
ARSENIC  IN  THE  SODA  OF  COMMERCE. 
Dr.  Fresenius  calls  attention  to  a  fact,  accidentally  discovered 
by  him,  that  the  carbonate  of  soda  (neutral),  as  met  with  in  a 
crystalised  state,  and  as  manufactured  at  the  alkali  works,  now 
often  contains  a  very  perceptible  quantity  of  arseniate,  or  arse- 
nite  of  soda,  undoubtedly  due  to  the  use  of  sulphuric  acid  for 
converting  the  common  salt  into  sulphate  of  soda,  which  acid 
contains  arsenic,  derived  from  the  pyrites,  of  which  few  are  quite 
free  from  arsenic,  and  some  of  which  contain  that  substance  in 
considerable  quantity.  The  tests  applied  for  the  detection  of 
this  arsenic  were  not  the  most  delicate  in  use  for  this  purpose ; 
and  the  quantity  found,  though  small,  is  sufficient  to  alfect  the 
purity  of  preparations  for  medicinal  and  chemical  use. — Chemi- 
cal News,  Nov.  5,  1869. 
TESTING  ANTIMONY  FOR  ARSENIC  BY  THE  MOIST  WAY. 
By  M.  Rump. 
The  author  states :  During  the  latter  end  of  last  year,  on  the 
occasion  of  the  inspection  of  apothecaries'  shops  in  Prussia,  a 
quantity  of  tartar  emetic  was  found  to  contain  arsenic ;  as  a 
