6  Syrup  of  Iodide  of  Iron  and  Manganese.  {   jl™X  mtu' 
chlorides.  A  small  amount  of  ferric  oxide  is  left  in  the  filter,  but  the 
amount  is  so  small  that  I  think  it  of  little  consequence  that  the  puri- 
fied salt  does  not  contain  it. 
Large  quantities  of  a  spurious  salt  are  prepared  by  a  house  on  one 
of  the  principal  streets  of  Louisville,  but  with  such  secresy  that  stores 
only  a  few  squares  distant  sell  the  salt  without  a  doubt  of  its  genuine- 
ness. It  seems  to  be  principally  magnesium  sulphate,  with  a  small 
proportion  of  ferric  sulphate. 
After  considerable  experience  in  purifying  Crab  Orchard  salt,  I 
may  state  that  the  usual  amount  of  organic  matter  in  the  salt  is  from 
8  to  12  per  cent.  From  20  to  35  per  cent,  of  loss  is  sustained  in  the 
purification,  the  greater  portion  of  the  loss  being  water.  This  loss 
need  not  be  met  with  by  pharmacists  generally,  a  partially  anhydrous 
salt  being  desired  by  myself  for  the  production  of  an  active  granular 
effervescent  salt.  I  would  commend  to  all  the  advantage  of  preparing 
the  purified  salt  themselves,  the  preparation  of  a  few  pounds  being  a 
matter  of  little  trouble,  and  yielding  a  fair  remuneration  by  the  satis- 
faction accorded  and  increase  of  sale. 
Philadelphia,  12th  mo.  18,  1873. 
SYRUP  OF  IODIDE  OP  IRON  AND  MANGANESE. 
By  J.  U.  Lloyd. 
I  find  that  syrup  of  iodide  of  iron  and  manganese,  as  prepared  by 
the  published  process,  viz  :  double  decomposition  between  the  mixed 
sulphates  of  iron  and  manganese  with  iodide  of  potassium,  is  objec- 
tionable, inasmuch  as  the  preparation  so  obtained  will  contain,  if  the 
precipitated  magma  of  sulphate  of  potash  is  well  washed,  an  appre- 
ciable amount  of  this  salt,  which,  after  a  time,  crystallizes  in  a  mi- 
nute form  throughout  the  syrup,  imparting  to  it  a  milky  turbidity, 
and  if  the  said  sulphote  of  potash  be  not  completely  washed,  the  re- 
sulting syrup  will  be  deficient  in  strength. 
In  the  process  above  referred  to  (U.  S.  Dispensatory  and  Parrish's 
Pharmacy),  a  large  amount  of  the  objectionable  sulphate  of  potash  is 
obtained,  so  that  I  find  it  almost  impossible  to  properly  manipulate 
the  syrup  without  meeting  with  the  above-named  difficulty,  and  to 
overcome  this  fault  I  prepared  the  following  formula,  and  have  for  a 
