THE  AMERICAN 
JOURNAL  OF  PHARMACY. 
J  AN  VARY,  1879. 
DIALYZED  IRON. 
By  G.  H.  Charles  Klie. 
Read  at  the  Meeting  of  the  Alumni  Association  St.  Louis  College  of  Pharmacy,  Nov.  19. 
Having  prepared  dialyzed  iron  several  times  with  but  indifferent  suc- 
cess when  it  first  came  into  use  in  this  locality,  I  was  induced  to  experi- 
ment in  order  to  overcome  the  defects,  not  so  much  of  the  iron  solu- 
tions employed,  but  principally  those  of  the  apparatus. 
The  dialisator  in  these  first  trials  had  been  constructed  by  tying  thick, 
well-soaked  parchment  paper  securely  over  the  wider  part  of  a  conical 
glass  vessel.  The  lower  intact  portion  of  a  broken  one- half  gallon  perco- 
lator was  used.  (To  prepare  such  an  one  for  use,  if  it  is  not  done 
by  the  regular  method,  a  very  convenient  and  expeditious  substitute  is 
to  tie  a  string,  soaked  in  spirit  of  turpentine,  in  *n  even  line,  a  little 
beyond  the  damaged  portion,  around  the  percolator  ;  light  the  string,  and, 
while  burning,  turn  the  percolator  diligently  that  all  parts  of  the  circle 
may  be  evenly  heated,  and  finally  plunge  it  into  cold  water  ;  according 
to  the  dexterity  exhibited  in  manipulating,  the  resulting  edge  will  be 
more  or  less  even.)  The  dimensions  were:  Narrow  part,  3  inches, 
and  wide  part  4J  diameter  ;  total  height,  including  funnel-shaped  pro- 
jection, 8  inches  ;  capacitv,  about  1  pint. 
The  solution  of  chloride  of  iron  used  in  all  of  the  following  processes 
was  of  the  strength  as  our  Pharmacopoeia  directs,  viz.:  2  fluidrachms 
of  the  solution,  diluted  with  water,  and  treated  with  ammonia  in  excess, 
yield  a  precipitate  which,  if  washed,  dried  and  ignited,  will  weigh 
28*25  grains  ;  the  water  of  ammonia  used  had  the  spec.  grav.  -960. 
To  4  fluidounces  of  solution  of  chloride  of  iron,  4  fluidounces  of 
water  of  ammonia  were  added.  After  the  liquid  turned  clear,  it  was 
put  in  the  dialisator,  as  above  described,  and  this  was  placed  on  two 
glass  rods  in  an  evaporating  dish  in  such  a  manner  that  about  an  inch 
of  space  was  left  between  the  septum  and  the  bottom  of  the  dish. 
Distilled  water  was  then  poured  in  until  it  reached  within  I J  inch  of 
