Feb^rifso!'"'  }         Tincture  of  Chloride  of  Iron.  8 1 
However,  if  one  has  prepared  the  solution  repeatedly,  and  has  taken 
the  trouble  to  test  the  same  each  time,  the  defect  of  the  formula  and 
how  it  is  overcome  will  soon  become  apparent. 
The  writer  of  this,  being  curious  as  to  the  quality  of  tincture  of  iron 
sold  here,  procured  twenty-five  samples  from  the  same  number  of 
apothecaries  located  in  all  parts  of  the  city.  These  samples  were 
tested,  as  the  Pharmacopoeia  directs,  under  solution  of  chloride  of  iron, 
viz. :  When  diluted  with  water,  it  affords  no  precipitate  with  chloride 
of  barium  or  ferridcyanide  of  potassium.  When  a  crystal  of  sulphate 
of  iron  is  added  to  a  little  of  the  solution,  and  afterwards  a  few  drops 
of  sulphuric  acid,  a  black  color  is  not  produced  near  the  crystal.  Two 
fluidrachms  of  the  solution  (or  one  fluidounce  of  the  tincture)  treated 
with  ammonia  in  excess  yield  a  precipitate  of  sesquioxide  of  iron,  or 
ferric  oxide,  which,  when  washed,  dried  and  ignited,  weighs  28*25 
grains.  The  external  characteristics  of  the  tincture  were  noted  also. 
The  result  is  given  in  the  folfowing  table  : 
of  ig- 1 
■Bp 
odor,  \ 
inide 
sium. 
f  Sul-« 
firon 
Sul- 
Acid.  1 
ample. 
uantity 
nitedSi 
oxide  0 
in  I  fl. 
tinctun 
_o 
"o 
thereal 
hloride 
Barium 
CO  O" 
Grs. 
U 
\A 
U 
I 
22-8 
light  yellow-brown 
slight 
faint  precip. 
no  precip. 
no 
black  color 
2 
2825 
light  red-brown 
none 
U  if 
<(  (( 
<( 
(( 
3 
24-8 
light  yellow 
slight 
a  <( 
blue 
(( 
<( 
4 
18-4 
light  red-brown 
(( 
((  i( 
no  " 
(t 
ii 
5 
20' 
red  brown 
modrt. 
copio's" 
blue  « 
6 
26-8 
light  yellow 
none 
>(  (t 
IC  n 
(s 
7 
12-8 
(< 
>< 
no  " 
it  (i 
it 
i( 
8 
24- 
n 
slight 
(<  (C 
<(  (( 
a 
a 
9 
24- 
a 
none 
10 
4-8 
brown-red 
strong 
faint  precip. 
no  precip. 
black  color 
1 1 
20- 
it 
none 
12 
22-8 
light  yellow 
slight 
faint  precip. 
blue  precip. 
no 
black  color 
13 
26- 
(( 
trace 
<(  (( 
(< 
14 
28- 
(( 
marked 
15 
28-25 
black-green 
none 
faint  precip. 
blue  precip. 
no 
black  color 
16 
28- 
light  yellow 
slight 
17 
18 
30- 
28-25 
brown-yellow 
light  yellow 
(( 
marked 
19 
24- 
brown-yellow 
modrt. 
20 
21* 
dark  brown 
none 
precipitate 
blue  precip. 
no 
black  color 
21 
28-25 
black-brown 
faint  precip. 
no  " 
it 
it 
22 
i8- 
light  yellow 
faint 
v'ryltl.  « 
(<  it 
black  color 
23 
16-8 
trace 
no 
ti  a 
no 
black  color 
24 
20-4 
brown-yellow 
marked 
faint  ** 
blue  " 
(t 
« 
25 
27-6 
faint 
small  ** 
no  " 
It 
