170  '  Wax,  Tallow,  etc.,  in  Stipjyositories.  {^^^rnljsn^'' 
rass,  or  any  convenient  bottle.  Add  the  sulphuric  acid  gradually, 
and,  while  the  liquid  is  hot,  add  the  chlorate  of  potassa  by  small  por- 
tions. When  all  is  dissolved,  filter  and  complete  twenty-four  fluid- 
ounces.  The  whole  operation  need  not  take  more. than  fifteen  minutes. 
The  following  equation  explains  the  reaction  : 
12(FeO.S03(  +  6SO3  +  KO.CIO5  =  6Fe203-3S03)  +  KCl. 
This  process  has  the  advantage  of  giving  out  no  fumes  or  smell  of 
any  kind  ;  the  product  is  free  from  any  acidity  but  what  belongs  to 
the  salt  itself. 
It  is  true  the  persulphate  of  iron  thus  obtained  contains  a  small 
Cjuantity  of  chloride  of  potassium,  but  this  does  not  interfere  with 
any  of  the  uses  for  which  it  is  wanted  by  the  pharmaceutist.  I  think 
that  the  nitric  acid  always  present  in  the  preparation  of  U.  S.  P.  is 
much  more  objectionable.  Besides,  any  one  who  has  followed  the  U. 
S.  P.  process  knows  that  it  is  always  when  one  tries  to  get  rid  of  the 
last  traces  of  nitric  acid  that  tlie  porcelain  or  enamelled  dishes  are 
broken. 
A  slight  modification  of  the  formula  will  give  the  Liquor  Ferri  Sub- 
sulphatis  U.  S.  P.  : 
R     Sulphate  of  iron,  coarse  powder,  twelve  troyounces. 
'  Sulphuric  acid,  one  troyounce  and  thirty  grains. 
Chlorate  potassa,  three  hundred  and  forty  grains. 
Boiling  water,  ten  fluidounces. 
Operate  as  above,  and  evaporate  to  twelve  fluidounces.    Filter. — 
The  Pltysician  and  Pharmacist^  Feb.  1871. 
ON  THE  USE  OF  WAX,  TALLOW,  ETC.,  IN  SUPPOSITORIES. 
By  Charles  L.  Eberle. 
(Concluded  from  last  number.) 
Slow  manipulation  with  a  mixture  of  wax  and  cacao-butter  before 
hardening,  we  can  readily  understand,  would  cause  a  granulation  of 
the  wax,  and  produce  a  cone  in  which  the  heat  to  which  it  is  to  be 
subjected  would  act  only  upon  the  cacao-butter,  to  the  exclusion  of 
the  wax,  which  would  then  remain  unchanged,  causing  irritation  and 
difficulty  ;  but  we  are  only  supposed  to  be  dealing  with  mixtures 
which  have  been  well  stirred  to  the  time  of  their  introduction  into  the 
mould,  which  mould  has  been  thoroughly  chilled,  and  the  suppository 
likewise.    Under  such  circumstances  the  mixture  is  uniform  and  per- 
