Am.  Jour.  Pharm  1 
May,  1883.  / 
Tinctura  Iodide. 
231 
Mix  56  parts  or  any  moderate  excess  of  iron  Avire  with  1200  parts 
of  water  and  254  parts  of  iodine  gradually  added.  When  the  reaction 
is  completed  and  a  light  green  solution  is  obtained,  filter  this  and  add 
to  it  the  remainder  of  the  iodine.  Then,  when  this  has  all  dissolved 
with  the  formation  of  a  brown  red  solution,  add  the  calcium  carbonate 
(150  to  160  parts)  by  degrees,  and  warm  the  mixture  when  the  effer- 
vescence slackens,  until  the  evolution  of  gas  has  ceased  and  all  the 
iron  is  precipitated.  Let  the  dense  precipitate  subside  and  decant  the 
supernatant  liquid.  Mix  the  residue  with  enough  water  to  restore  the 
original  weight;  let  subside,  and  again  decant.  Mix  the  two  decantates, 
pour  the  solution  upon  a  filter,  and  when  all  has  passed  through,  pour 
the  sediment  into  the  filter  and  wash  it  with  water  until  practically  free 
from  calcium  iodide.  Unite  all  the  filtrates  and  evaporate  the  mixture 
until  a  dense  pellicle  forms  over  the  surface  and  boiling  continues  only 
at  a  narrow  vent.  Now  pour  the  fused  salt  into  a  shallow  plate  of 
suitable  size,  cover  it  well,  and  when  cooled,  detach  the  hardened  mass, 
break  it  up  and  preserve  it  in  well -stopped  bottles. 
NOTE  ON  TINCTURA  lODI. 
By  Henry  C.  C.  Maisch. 
Head  at  the  Pharmaceutical  Meeting^  April  17. 
Four  samples  of  the  tincture  were  prepared,  using  the  proportions 
directed  by  the  U.  S.  Pharmacopoeia,  1880.  For  two  of  the  samples 
alcohol,  U.  S.  P.,  1880,  was  used;  the  other  two  were  made  with 
absolute  alcohol.  To  one  of  the  samples  made  with  each  kind  of  alco- 
hol, table  salt  was  added  equal  to  one-half  the  weight  of  the  iodine 
used.  The  ingredients  were  put  into  stoppered  bottles,  which  were 
agitated  at  intervals  of  about  half  an  hour. 
Three  hours  after  the  experiments  were  begun  the  iodine  in  the  spe- 
cimen prepared  with  absolute  alcohol  was  nearly  dissolved,  and  was 
completely  dissolved  one  and  a  half  hour  afterwards.  The  iodine  in 
the  specimen  made  with' absolute  alcohol,  to  which  chloride  of  sodium 
had  been  added,  was  dissolved  in  three  hours. 
The  samples  made  with  alcohol,  U.  S.  P.,  took  a  longer  time  to  dis- 
solve ;  the  one  to  which  the  sodium  chloride  had  been  added  was  fin- 
ished in  seven  hours,  but  the  one  to  which  no  salt  had  been  added 
re(|uired  one  day  to  produce  a  perfect  solution. 
Ten  grammes  of  the  tinctures  prepared  with  sodium  chloride  were 
